Originally had a TT510 wich I loved but hated the inaccuracies of the map and then saw the good reviews on the Nuvi 660. Sold the 510 to get the 660, which I did not like at all except for the great map, returned it and went with a 910 as I verifed on Teleatlas website the fixes for the areas I had problems with. Only thing I wish the TT had is when arriving at the destination, it tells you if it is on the left or right.