Thanks Chris---fixed the link.
Regarding ease of operation, their website says...
Simple, two-button ON/OFF and Start/Stop make the Replay XD1080 camera easy to operate. Simply turn it ON and Press Record to Start. The built-in LED & Vibration Feedback tell you that you’re ready to go.
So I'm guessing this is a LOT easier to operate (even with gloves on) than the GoPro.
I like aspects of the GoPro's design. And I don't think the ReplayXD is 100% waterproof (just water resistant). And the GoPro still offers the clipon LCD, which is really nice (except when I tried using it, I was pi$$ed-off that they didn't include some way to actually REVIEW your footage on the LCD---WTF?

)
But for me the field-of-view is the dealbreaker for the GoPro. I once emailed them about it (this was a couple years ago) asking them why they don't offer interchangeable lenses, so you can have a narrower field-of-view if you want it. Their response? "Nobody wants a narrower field of view. Everyone loves the super-wide-angle." (Well, the masses aren't exactly known for intelligent decisions...)
Scott