Shuttles are great computers if you want something very small they can not be beat. I use both micro atx systems and sff (shuttles). I have a few now, my rock solid old P4 (nw 3.0c running 3.6ghz) lasted 4 years while running 24/7 and logging close to 12 hours a day of usage. The major disadvantage is lack of non oem parts, i.e. a mobo replacement is expensive. The advantage is the initial cost is low. The psu's are much stronger then their rating compared to similar rated standard psu's. Since you get a cool, cpu cooler with the deal they are very reasonably priced and easy to build! Put some foam on the inside vents and you got a filtered system you can have up and running in a few hours. This new crossfire unit should rock with the new 700 series ati cards. Bios upgrades can be a pain, or lacking, so make sure the initial bios works for your set up. I love shuttles! If you fill your system will lots of drives and dual video cards you can tweak the cooling by adding second fan in the back of the shuttle dual, fan out.