I buy this gpsr a couple of month ago primarily for geocach . I be use a very low end Garmin but be tire of the paperwork and be want to go `` paperless '' with my geocaching . I be glad I make the purchase . the unit have a little weight to it but feel good and secure in the hand with the rubber coating on the outside . it certainly have a rugged feel that inspire confidence while out trek through a trail . screen size : Screen size be good and bright enough to use in full sunlight . Touchscreen : it take I a bit to get use to the touch screen . I have become spoil to the slick use of the touchscreen on Apple product and the 510 be `` clunky '' in comparison . with time I be get better at use it , but it be no ipad or itouch that be for sure . menu : the menu option be excellent . for those who be upgrade so they can go `` paperless '' with they geocaching , you will be in Heaven . what you need , when you need it while out there tromp around look for that ellusive cache . very satisfy to click the smiley face to log a `` find '' while still stand at Ground Zero . the menu path be definitely different than the button drive one of the Garmin but once I become accustomed it make sense and be very useful . Satelite Connectivity : excellent ! the 510 obtain connection very quickly and seem to doggedly hold it even when under a tree canopy . this may be my favorite attribute of this unit . Compass : to be honest I have not use it enough to give a good opinion . the more expensive explorist unit -lrb- 610 and 710 I believe -rrb- supposedly have a better one but it have be a non-issue for I . battery use : I have find the 510 to be pretty frugal on the use of my battery . however when I decide to take the plunge in to paperless geocach I go ahead and buy some rechargeable battery . they be realy not that expensive and definitely cheaper in the long run . downside : at first I find myself fumble around with the Magellan menu and touchscreen . it require a few day to get use to it and become comfortable navigate the menu . one downside I have find be that when I want to scroll the screen around I accidentally `` set '' a waypoint and the screen center on that . irritating , but easily correct . I be hope to find a setting that allow I to remedy this issue . also I have have the unit lock up on I three or four time . the fix be to take the battery out and let the unit reset . then reset the cache you want as you waypoint . not a deal breaker on this unit but definitely irritating . a friend of mine have the same issue with the 510 but have solve it with a download suggest by Magellan . I 'll definitely do that as well . overall : I do not regret this purchase in the slightest . I now wonder how I make it without the 510 and for the price it be a great way to switch to paperless caching . I would definitely recommend this unit for purchase .