Chris Krugwrote a review of Zeal Transcend GPS PX Goggle - Polarized on December 8, 2011
I love these things. I use them for snowkiting and for my application they've been absolutely perfect. Battery life is great, accuracy is great. I carry several GPS units on me but this takes away the hassle of stopping to look at the others. Side to side visabilty isn't as good as a non-gps goggle but given what it is I see just fine. No tunnel vision. They fit in my helmet great and no gap. The lense is awesome.
The only downside I had is the screen doesn't exactly line up with my eye. It worked fine for others but my eyes not quite. I shimmed the screen a little and now it's perfect.
They're a little pricey but given that you get a first rate goggle and GPS system and a hell of a lot of WOW factor they are worth the cost of admission.