I was an early adopter of Virtual PC on OSX. I have to say that it never worked to a performance level of being useful even for business needs like running basic business apps like Excel, Outlook, Visio, Ecco Pro and the like.

I abandoned the idea of VirtualPC once Microsoft bought connectix as they were still the EvilCorp of the time.

I did not see any useful PC virtualization on OSX until Apple switched to Intel and VMware jumped into the game.