I own 3 gp , one garmin , one tomtom 910 and since yesterday a 510 . I use the garmin on the trail and the jeep , and my 910 have be with I for a couple of month cruise Europe and North America . I buy the 510 , because it be cheap and also base on my experience with the 910 . my wife want a gp in she car so I order it , in 5 min at work ... then , a couple of day later , while wait for the item , I start read the review and be stun by some of the negative comment ; 2 possibility , either I buy a lemon , or some people have no idea of what they be buy or how to operate a basic electronic device -lrb- like have the 12.00 flash on they VCR -rrb- ... after own the 510 for 10 day , I now believe that some people should stick to paper map ! pro : setup : 20 min , include download the update , and set up the bracket on the windshield of my wife car . navigate the menu be a breeze . reliability : perfect . not one reboot ... the 510 will even navigate through some forest trail in the mountain . pous : plentiful enough ... Bluetooth : synch it with my blackberry pearl the FIRST TIME !!! con : none so far ...