I have be use a older Garmin GPS in my car for some time . it be not a street pilot , it be a Garmin III . I buy the TomTom go 300 and can not believe how good it be . the ttg 300 include everything you need : detailed map of the usa on the 1 gb sd card with those map and additional map on cd . it have mount hardware , power cord , etc. but you probably know all that . I be impressed with how well it pick up the satellite signal . my Garmin would never pick up a signal inside the house , and it would often not find one on a cloudy day . the ttg work fine in both case . the voice be clear and loud -lrb- adjustable -rrb- and you can have it give you a new instruction at any time . it will navigate to a address , a nearby `` point of interest '' -lrb- bank , airport , park , hotel ... -rrb- . and it will find alternate route if you hit a roadblock or just do not like the suggest route . you can tell it to build route that be fastest , shortest , for biking or walking . you can avoid toll or not . I really like the choice . I think the screen be easy to see and the screen update be plenty fast . so far the map datum have be fairly accurate . around my home town I notice that some road that be 3 year old be miss , but I would expect that . the TTG will show you on the road even if the map datum be a little off . in other word , it will snap you position to the map road even if you drive off it a little . but if you go far enough off a road , it will show you exactly where you be -lrb- in the middle of field or whatever -rrb- . the menu be very easy to use . much easier than I expect . you use the touchscreen to pick a city , street , address , and you be off . it do have the 3-d view of the map which be similar to the view out you window , but I still prefer the typical 2-d map view . you can see more street that way . the point of interest database have lot of place . I do not know the exact number of category but I would estimate there be at least 25 category -lrb- bank , airport , rental car , amusement park , gas , theater , courthouse , police , hospital , doctor , dentist , border crossing , zoo , etc. -rrb- and you can create you own category and add place . I do not find a list of ATM 's , however , and this would have be useful . you can also view the satellite signal strength , battery life , and actual Lat\/Long . I wish you could enter a Lat\/Long as a destination , but alas , you can not . as other people have say , it be very difficult to see in bright sun . at time , I have to reposition it to reduce glare , but this inconvenience would not stop I from buy it again . I have not use the bluetooth feature and can not really see myself pay for the subscription feature . overall , it be a very powerful navigator . it come on when I start the car and go off when the car stop -lrb- because the cigarette lighter go off -rrb- . it be very easy to use and very easy to follow . I actually want to take more trip now just to let the ttg figure out the best way to get there . and now my friend all want one . I see Garmin now have a similar model , which I have not try . but I would still buy the ttg again if I be shop for one . Update 4 month later ... I still like the unit and its function , but as other have say , the map datum and route be disappointing at time . it always get I where I want , but half the time it seem to take I the longer way . it seem to be reluctant to put I on a freeway for short trip , even when it be faster . and I have not really compare this to another brand , except for the system in the the Audi a4 , which do seem to do a better job : even know what side of the street you destination be on . but that be not a after-market system . so if I be shop for a after-market system today , I would most likely still buy the Tom Tom for the feature , but I would take a close look at the route be suggest while drive .