I remember using OS9 on my grand father's old G3 iMac and was pretty excited when OS X was released. I was not taken back enough to buy my own Mac until 10.4 (Intel) was out and I purchased a 20" iMac C2D and have never looked back. Now I've switched my own family over to the Mac and happily spend my evenings on my 27" i5 iMac! Most importantly, what version of OS X made you switch to the Mac? 10.4 for me!