I have have this gp for almost two year and use it every day . it work exactly as it be suppose to work . I use the weighted dash holder - not the windshield mount . I also add a sd card to backup my address , but I have never have to resort to this . it be very user friendly , and everyone in the family have no trouble use it . one time I have a problem get get reception . I contact tech support and quickly receive some advice that work right away . -lrb- it turn out that dust can collect in the antenna attachment - I be tell to just pull it off , blow on the connection , and replace it . Voila - satellite connection be restore ! -rrb- other than that , I have have no problem with my unit . the only two issue that would make this gp better would be to have it smaller and to have a internal battery . however , even with these drawback , it be a great gp , and my entire family have be very happy with it .