I am just getting a handle on my new Mac Pro Quad Xeon. I left it stock but for the memory which I kicked up to 9 gigs. I bought the new 8 gigs from OWC ( recommended supplier by you folks) and installed it myself. Worked perfectly. I now have this lovely giant sitting near my darkroom ( a dehumidified dry space where it sits) and am enjoying the best computer experiences I have had. It is fast and I run, regularly, PS CS3, Nikon Capture NX, email and a browser simultaneously. No slowdown at all. In fact, I think it is hungry for more to do. Unfortunately, I don't multi task that fast. So, I was wondering how others who have upgraded from other Macs or, like me, have come over from PC's are enjoying their experiences. I liken this to an upgrade from a roller blade to a (name your sports car). A toast to Apple!