The seller seems to be legit - ie he has good feedback and a high number of sales - the price just doesnt fit. An Edge Pro 2 trem would set you back about $130 alone - see http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330054733985&category=41407.

Seeing as the guitar is a copy (note it only says "Jem" but there is no mention of Ibanez) then so is the trem, usually you are talking about pretty nasty pups in a guitar like that.
Only way to find out is to ask the exact brand name of the guitar then search for an online review. My biggest concern at that price would be the neck too... plus the body might be made out of plastic :eek:
Might be cool for smashing up on stage - especially if you can paint "Ibanez" onto the headstock :D (pricey for a stage trick though!)