Vai uses them, and I think it's safe to say that he uses his bar more than most of us.
Vai.com: All About EVO
Anyone running this setup?
No need, I use real Floyds.
In all seriousness, though, I have yet to try any sort of tremsetter/stabilizer that didn't negatively impact the feel of the trem. It is pretty much the reason I refuse to use any other trem bridge, since the OFR is the only one that stands up to repeated abuse (excepting the modern Gotoh, which has the same case-hardened construction as the real thing).
Would you look at that, his favorite guitar isn't basswood, and Eddie still has the same OFR on his Frankenstrat. /h8