I have a Garmin 510D and it's brilliant! i paid £250 for mine, i had the chance to try a Tom Tom which was £150 dearer than the Garmin and TBH the maps on the Tom Tom were not a patch on the Garmin! much much superiour maps! some of the sat navs have soo much acssesories on them ie bluetooth MP3 etc that they are not soo good at navigating, but i can highly recommend Garmin. Outside Britain Garmin are the most popular Sat Navs it just seems to be here Tom Toms are in as they say, but i was really dissapointed with the Tom Tom!