Just ordered it...should be getting here in a week from overseas. I'm intending to use it for karting sessions, though a quick read of the karting forums has a big debate on mirror usage in karting. I think the WKA has mirrors as illegal in kart racing. I understand the arguments against, I would just prefer to have situational awareness than not - don't intent to get offline or block or any of the other no no's...just like to know what's going on.
Should be pretty cool, will try it out and report back