I'm not a big computer person, I just know how to run it and that's about it, so differences in computing power aren't that big of a deal to me.
All I know is that I've used PCs my entire life. I've used Macs before and because I have only used PCs, Macs are just wicked awkward to me.
As for XP versus Vista I can't honestly tell the difference. I mean, I know stuff about computers, I can do computer stuff, and I can see the differences, but theydon't seem bad to me. They're just different.