For all those that keep asking, soon you may be able to run Unity on your PC...
This device enables you to install and boot Leopard on certain PC hardware without any hacks. The most important part is that you can update Leopard using Software Update without fear of kernel panics or other issues.
EFI-X is seen as filling the desktop gap in Apple's product line-up; now people can use mainstream quad-core processors and swap in powerful graphics cards without having to purchase server-grade Mac Pros. One can price a system that beats the Mac Pro in most benchmarks for less than $1000 (see Gizmodo review).
At issue is whether Apple's EULA is legally enforceable (they say you can only install OS X on Apple-branded computers). Also, some wonder if EFI-X reverse engineered Apple firmware. It should be noted that EFI is an open standard, and if EFI-X makers wrote the code from scratch, there probably isn't much Apple can do about it. Especially since they're not in the USA.
Reactions are across the spectrum.
Some Apple die-hards are furious that the unwashed are able to use their less expensive but powerful gaming PCs to run OS X. They're already declaring it "illegal". At the other end is the Hackintosh underground who are also angry that a device such as EFI-X is being commercialized when free alternatives exist (such as Boot 132). Besides, hackers never like it when things "just work" like EFI-X. Others are thrilled that affordable, upgradeable, OS X power is now possible without having to shell out over $2000 for it.