Myr, I just did some builds on some machines that were 64 bit XP os's. A couple had 16 gig of memory. Talk about fast! The ran hot as hell though. Did four machines at the same time and it heated up the office I was in. I'd love to have one.
I have 6 gigs on mine, it runs very fast, but still having a couple of issues with programs which I am sure I will figure out.

I am a technophile, but I have always took basic equipment and upgrade it myself using what I could find. This is a monster compared what I previously owned.
Helice, I have no idea if they were telling the truth or not, my reaction to what they said was based upon my experience with Norton. Also, I was unsure if a reliable and free 64 bit compatible virus program exists. I have been very busy so I have not had as much time as I wanted to explore the computer. Usually within the first hour of getting a PC home, I have the case opened and I am looking inside, but have not had the chance to do so yet. I don't like being tied to renewing expensive anti-virus subscriptions etc, but I wanted good protection on this new PC, and wanted it right now, so I was too quick in agreeing to their suggestion I guess.
So far Vista is looking pretty sweet, so the devil might win me over yet.