I run the Nuvi 500 and love it. Much cheaper than a zumo and it is still waterproof and made for the vibrations of a motorcycle. I would buy the same again in a second if required. No problems yet. Only thing I have disliked is the battery time is about 4 1/2 hours, just need to plug it in after that or use the cable all the time and not worry about it.

Adam

 

If you go to www.cnet.com you will get expert opinions on both units. There are many problems with the Tom Tom Rider 2