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I'm in the market for a GPS, narrowed down to either the Zumo 350LM or 665LM. I am leaning towards the 350 as it looks a bit sturdier and I've heard the Nav function is slightly better than the 665, namely the resolution is better when zoomed in closely. For the 665 users, are the extras such as XM and NavWeather worth the extra coin? Any issues with durability? Keep in mind I already have a Sena SMH10 headset I stream music through and will get audio cues for Nav by phone.
This is part of a larger plan to put together a nice on board suite eventually streaming Radar, GPS, and phone through a Sena SM10.