i used floramite once, sort of as a nuclear attack, and followed that up alternating neem and avid. after just a few treatments, never again.
it's very, very important to note that you absolutely must alternate your treatment, though, no matter what you use, if you want it to be/remain effective. those little fuckers adapt all too well.
i beat the piss out of mites, with plenty of products left over for any future outbreak, with the aide of ebay and about $40.