There are a few things you need to know before hopping on the Psystar Mac clone bandwagon: You can't download a software update, which means patching is impossible. You'll never be a card-carrying member of the Apple ecosystem.
There are a few things you need to know before hopping on the Psystar Mac clone bandwagon: You can't download a software update, which means patching is impossible. You'll never be a card-carrying member of the Apple ecosystem. And the hardware doesn't come close to the designs Apple offers. Those caveats aside the Psystar Open Computer isn't so bad.
The good: Faster, more affordable, more upgradable Leopard OS X-based system than anything currently offered by Apple in this price range.
The bad: With limited software updates, you're effectively cut off from all future Apple products, at least for now; no Bluetooth or IR receiver; no Front Row or iLife.
The bottom line: Its hardware isn't made by Apple's design team, it will likely never work as a full member of the greater Apple ecosystem, and one ill-intended software update could turn it into a $750 brick. Get past all of that, and you'll find Psystar's OS X-based Open Computer a fast and otherwise compelling lower midrange desktop.
CNET's Rich Brown notes that the Psystar lacks the polish and doesn't feel like a Mac. Overall, the Psystar is comparable to the Mac Mini you just need to know the limitations.
Overall, the Psystar performed better. A look at the benchmarks:
What this buying decision ultimately comes down to is how much you value design, the importance of the software update and whether you're willing to take a few calculated risks. Everyone will be different. If the Psystar turned into a brick due to some software hangup you could install Windows or Linux. That said a lot of us don't want to be bothered with installing a new OS on the weekend.
More reading that may help you make the Psystar call: