So I had an iMac, and also a Macbook Pro. I've always absolutely loved the G5 and Mac Pro - ever since they came out. I almost got a G5 years ago, but I opted for a similarly priced PC at the time. I've always wanted to know what it is like on the other side! So finally, recently I bought a 2006 Mac Pro - 2.66ghz cpu used. I love it, and I did a few things that really helped it out - and for anyone considering this machine, as can also be found from searching the forum, these things do work great: 1.) I put in an OCZ Vertex 2 SSD drive. Big difference, it's much faster loading applications and starting up. I used the OCZ adapter mounted to the adjacent drive to hold the SSD drive in place, works great. Booted right up. 2.) I changed the ATI 1900XT for an ATI 5770, took 2 minutes to do and booted right up, performance is much better in games. 3.) RAM! Ram is so easy to add. I had 5 gigs, and am now up to 9 and want to go to 12 or 16. 4.) Bluetooth and Magic Mouse: My Magic Mouse was giving me tracking problems, so after a few searches, apparently the wires on the bluetooth/airport modules are switched. So I popped open my case, and switched the wires to the recommended positions, and all of my bluetooth problems were solved! I have the magic track pad too, and while I like it, I still feel the mouse is more accurate when pointing in precise documents or entering stuff like music notation. Overall I am happy! These machines are still very capable and fast, plus the expandability is amazing.