These are awesome little computers, and I'm referring more to the design than the hardware. I run OS 9 on my Cube, so I can't attest to its ability to run OS X well enough on the stock hardware. There are a few upgrades you can do to it to make it more OS X worthy, but there are a few caveats. If you upgrade the CPU using a Sonnet or Powerlogix upgrade, you'll most certainly want to install a base fan to ensure adequate heat dissipation. Be careful what you throw at it, though. I have a Cube with a 1.5 GHz CPU upgrade, and I added a Radeon 7500 video card which fried the VRM. There are lots of good online resources for information regarding the Cube. Check out cubeowner.com.