I've looked at Revolights, and price aside, I thought they looked cool as marker lights, but my reservations with them, price included, are three-fold.
First, they seem prone to damage, sitting proud of the tire as they want to do. Things like scraping curbs or rack insertions seem hazardous, and depending on what kind of space you've got to store at home, carrying a bike or just navigating a cluttered garage seems to present snag opprtunities.
Another thing is the flickering of the front lights being annoying. MI can't run a flashing headlight because it makes me nuts.
Finally, the price. $200+ can get you a great, proper headlight/tailight combo. Sure, the Revos are about style, and I get that, but I really like having a moveable headlight that I can swap 'tween bikes easily, and that takes priority for me.
For me, if they were just a bit cheaper, I'd buy 'em and try just for giggles, but right now they're priced out of my 'sh*ts-n-giggles' expenditure range...and I've got a pair of Monkeylights!