Hi - just saw this incredible video of a guy rolling off his bike into a ditch and getting up and walking away thanks to a Helite Airbag vest. Has anyone had any experience with this product, good, bad, or indifferent? How do they fit? Are they comfortable? Are they warm? Seems like a great idea but at $US 650, I thought I'd check the forum to see if anyone else has used one and with what kind of feedback. Thanks all!