Ray's review is based on some actual usage along with the Garmin information. He's the gold standard as far as I'm concerned. I expect we'll learn more from him before the unit ships later this quarter. He's great at addressing comments on the reviw.

I like better resolution, particularly when it can display OpenStreet maps. Detail is good. Estimated battery life is 15 hours, lower than the 510's and 500's. The MSRP is $30 lower than the 510's.