someone on another site was selling theirs for super cheap and I thought about snagging it, but my small local mtn really doesn't warrant that much high tech/info and I rarely travel to other mtns that would. I also heard they're bulky...ain't nobody got time fo that.
smith just came out with a recon goggle as well. They put it in their new I/OX line.
I imagine its a quick glance, like while I'm driving on a highway checking my rear view mirror. I wouldn't check my rear view while taking a hairpin turn at high speed, but when ok, I check it all the time. I suspect it's similar to using these goggles and that safety/crashing shouldn't be the slight bit of a problem as long as you use common sense.