Primarily based on anecdotal evidence (much, but not all, of it here):
There was a "bad version," a few years ago, which were prone to some defect that made the heels pre-release unpredictably. The problem was later fixed. The plastic shell on the good version is mostly black (both heel and toe piece), with colored inserts (red, yellow, green, gray or orange) made of semi-transparent plastic and a colored snout on the toe. The older problem-prone ones had colored plastic shells. Actually, the "bad" ones I've personally come across all had red shells (race). I don't remember if they came in the whole rainbow that year.
If the current version is adjusted correctly it seems to work fine. As with pretty nearly all bindings, you need to ensure the forward pressure is correct or you'll walk out of the toe, heel or both. Also as with pretty nearly all bindings, there are some people who are emotionally opposed to them.