I use this 4.3 '' version in my car ; the 5 '' version would be just a bit too large . pro : \* the gp be easy and logical to input address into . it also quickly find every address I have put in so far and the give route be very reasonable to I , give my knowledge of the area and road . \* the touch screen be very responsive . \* the suction cup and mount bracket work very well . no adhesive need on two different car . \* both the mount bracket and the power connection be magnetic and work better than I anticipate . fast and trouble-free connect and disconnect . \* the screen seem fine and normally responsive in cold weather -lrb- -10 f -rrb- . \* you can connect the gp to you pc and the internet to get free lifetime map update . First you Download and install the `` mytomtom support application '' . then you connect you gp unit to you pc and turn on the GPS . then the TomTom software open you default browser automatically and load you TomTom account page -lrb- once you have a account -rrb- and give you a status . this be also dependent on if you have you browser cookie save for TomTom -lrb- you can use a white list if you regularly discard cookie -rrb- . when connect and update map , you browser window say `` TomTom GO -lrb- model number -rrb- '' , then `` install ... '' . quite logical and easy to use . \* on certain screen you can control map with finger swipe and 2-finger zoom -lrb- similar to a iPhone -rrb- . \* the screen be very bright and can easily be see in intense daylight . there be a night mode -lrb- that it can switch to automatically -rrb- and the screen 's brightness be adjustable . \* it display the speed limit on that section of the road . it be very accurate on both where the speed limit change and what it be . this help I with the age old question : `` what be the speed limit here again ? '' \* Traffic Information feature : this can recalculate you trip time , and suggest alternate route , depend on traffic . this feature could be great , but it appear to not be available in my city . on the TomTom website you can get a list of city available . my city be not list . the car power cord have a traffic receiver build into it -lrb- when you connect the car cord it say `` rds-tmc receiver connect '' -rrb- . while I be not really sure how this feature work technically , the manual say that the gp display traffic datum with red indicate congestion and green show no problem . pro with limitation : \* the manual be extremely easy to read and get you start fast . it explain the GPS graphic well . most of the GPS menu be intuitive and with a bit of work you be good to go . however , the manual do not go into great detail of all the option and setting . for basic task this be not a big deal as they be fairly obvious . however , there be a few option that take I forever to find -lrb- see below -rrb- . \* the unit have the ability to use command speak by you . for example , `` calculate a alternative route . '' when work , it be great , but it have a few major stumbling block . first , it take I forever to figure out how to turn on the speak command option . it turn out it be bury under the `` make you own menu '' option and a check box of `` voice command and control . '' it be nowhere else . not obvious ! next , the unit do not give on-screen prompt for what command work , so you have to know this . to view a list of voice command , you go under `` help '' in the Main menu , then `` Product manual '' and then `` what can I say ? '' again , not obvious . \* this unit have Bluetooth -lrb- BT -rrb- for link a phone and use hand free . the speaker quality and dial portion work well . but this BT feature have its problem . when the GPS be turn on , it find the paired phone . it then automatically retrieve the phone 's current contact . so far so good . however , when you display the contact , the phone number be okay , but it list all the name as a bunch of number -lrb- a software bug no doubt -rrb- . where 's Joe ? or Betty ? very aggravate . you can only find they by they phone number . so the import phone book be pretty worthless because of this . some quick web search seem to indicate this be a common problem . further search have not come up with a solution for my gp model at this time . con : \* power up and down . some car have power a -rrb- go to they cigarette lighter -lrb- cl -rrb- adapter only when the key be turn on , b -rrb- other car power the cl all the time , regardless of the key position . it would be nice if this unit adapt to both kind of car . for example , for key car the unit do not power up when power be apply via the car 's cl adapter . this feature would be handy so when you start you car , the gp start . it have shut down cover though , as it have a option for the GPS power after 10 seconds if no power be come from the cl . for constant power car , it would be nice to have a option to have the gp turn off when you car have not move in 10-20 minute . that way the GPS would turn off when you park and leave . while you should probably un-mount the gp while parking on the street for theft reason , this would take care of you garage parking , etc. . of course power on will not be cover , but you can always hit the power switch . \* it do not have any sd or microsd card slot . some people might find this a limitation as other unit have it for audio file , etc. . minor con : \* when connect to a pc , it start off flaky ; sometimes work , sometimes not . the problem seem to be a software driver issue -lrb- I have Vista -rrb- that finally fix itself after I let Windows find a driver on its own . it take several try . \* the unit use a proprietary connector on the supply cable . it be not a Mini-USB . this might be problem only if you lose you cable . \* polarize sunglass can impede you view of the GPS screen . however , this be fairly normal with electronic screen , so not particular to the TomTom brand itself . helpful hint : \* the unit can occasionally have a software hang-up -lrb- as do most brand , so this be not unique to TomTom -rrb- . to reset , press and hold the power button for 15 seconds until a quick drumbeat sound . \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* 2 update , August 2011 : Battery die July 2010 : my unit 's internal battery go belly up . I get this unit in November 2010 . after email TomTom they instruct I to return it to they at my cost . they then send I a new unit . deal with customer service be acceptable . not stellar , but not bad . however , find how to file a email claim be challenge on they web site . they want you to try all the faq helpful hint first . while this be understandable , I would prefer the link to customer service be more intuitive . good news ! the `` legal notice '' screen '' have disappear : when I recently connect my unit to get update , I notice the startup screen warn about liability and etc. be finally go . I find the startup `` lawyer screen '' , irritating . yes , I realize I still have to pay attention to the road ; I do not need a screen to remind I about the hazard of distract driving .