Hi,I just wanted to share my experience of the 350 with people.I recently got the zumo 350. I compared it with the 660 and tom tom,to cut a long story short the power lead off the battery to the cradel that holds and charges the sat nav unit did not work,I have since noticed the 350 has 2 charging pins,the tom tom rider has 9 and the 660 has 18,one thing you need is power to the unit so I would go for the tom tom that is the same ish price as the zumo 350,luckly Halfords took it back and I got a refund