I don't know what those folks told you, Genexi2, but either they mistook BootCamp for Parallels or they were talking about some possible driver issues -- and you can also have severe driver problems on regular Wintel machines, so that is nothing Apple-specific.
I cannot complain about the XP-performance of my iMac, and even on Vista it runs good (as far as one can say that about Vista). Microsoft Norway showed off Vista on a 24" iMac when they launched the new OS, so the Mac performance and compatibilty cannot be that bad. ;-)
http://www.tuaw.com/2007/01/25/microsoft-norway-demos-vista-on-a-mac/
I cannot complain about the XP-performance of my iMac, and even on Vista it runs good (as far as one can say that about Vista). Microsoft Norway showed off Vista on a 24" iMac when they launched the new OS, so the Mac performance and compatibilty cannot be that bad. ;-)
http://www.tuaw.com/2007/01/25/microsoft-norway-demos-vista-on-a-mac/