They're lovely once they're set up, but a pain in the ass to get right.
Personally, the only tremolos I would ever intentionally have on a guitar, again, are the Parker and PRS trems- mainly for tonal reasons, followed shortly by stability.
Something I've always hated about the majority of floating tremolos is the obvious "floated" tone- that it simply doesn't transfer enough sound into the wood.
The Edge Zero is no exception (good, though, it may be).