I purchased and have since returned my Navigon 7100. I would suggest that if you are considering the purchase that you would wait until Navigon works out the bugs. I tested the 7100 against my Nuvi 360 and found the 7100 to have a beautiful screen, but some problems. If the 7100 has to 'recalculate' your route due to your missing a turn or leaving the route too soon it will try to have you double back, miles in order to put you on the same exact route. My Nuvi just recalculated and kept me going in the direction of my destination.
Read the reviews posted on Amazon.com. The reviewers that give it high marks I believe haven't really tested it. If you cannot wait to have the latest GPS make sure you buy it from someone who accepts returns due to the product not living up to your expectations.
I've read amazing things about this newly released navigation device and am surprised that there is no hum here at CNET. Is there a review coming soon?