I am a switcher. I switched from running Virtual PC on my 800Mhz iMac to running MS Remote Desktop Connection. I have a cheap 733Mhz Compaq tower under my desk and it cost me less than the Virtual PC software.
Performance: I get much better performance running the PC over RDC on my iMac screen than I was ever able to achieve with Virtual PC. I use the PC for apps that are not available for the Mac and for me iMac + RDC + a cheap PC is a better solution than iMac + Virtual PC.
What do you think?
-Snowster