I have a 350C in the car. It's easy to operate and customize to an extent. Putting it on the bike would be a crapshoot because it isn't waterproof. In the bang for the buck department, you can't beat it.
I have a 350c mounted on my wing. It works real well and is easy to use. It isn't water proof but I carry a zip lock baggie with me. If it is raining I just put the baggie over it and zip the ends shut, it woks OK. I used the mount that came with the GPS to mount it. I popped the Gold Wing emblem out on the dash right above the radio.
I drilled two holes towards the center of the mount and mounted it where the emblem was. I can take the two screws out and remove it and put the emblem back in and you can't see the holes. I am verry happy with mine and the price is right.