I have the earlier 350 and I am very happy with it. I pre-plan all my rides to include as many roads I've never been on as possible, then forget about where I am and where I'm going and just follow the lady's directions and enjoy the road.
Rock solid, reliable pairing with my Sena bluetooth intercom. Good directions compared to other GPS I have used.
I found the maps to be very accurate everywhere I used it: so far Quebec, Ontario, Vermont, Maine, NY, NH, Mass, Fl, Nv, Az, Ut, Wy and Wi. Speed limit indications are good reminders, but not reliable, though.
I use Garmin's Basecamp to plan all my rides. It takes quite a while to get the hang of it, but it does the job. It won't auto-plan your refueling stops, however. I know Streets and trips will help you do it, but it doesn't play nicely with Garmin stuff.
There were some annoying hiccups with some firmware versions where the unit would repeatedly freeze while riding, but this has been fixed for a while, now.
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