Simple answer, no.

I haven't encountered any other boxers who run on iMac but I wouldn't really advise it for 5 boxing.

I run 3 accounts on an i5 iMac with 12gb ram in Mac OSX with a key cloner only.

OSX is great for boxing and I'd like to see a complete suite like ISBOXER for it.

The problem with the iMac is HEAT! The iMac i5s and i7s are easily powerful enough but because of their compact design, the fans fail when you run 3-5 clients, hence I only run 3.

Also, you cannot assign memory using OSX and as far as I'm aware, you can't assign the memory in fusion ware which is a critical part of boxing.

Mac for fun but for owning in boxing, go for a PC (Can't believe I'm advocating buying a PC /cry)