> is it worth the 4.6gb of download ?

Do you want to run any OSX apps? If you just want to check it out, get the vmware image instead. I find it worth it because I need to use Garage Band. In the end if you just want to use your computer, I find OSX is fast and easy.

If you want to play games and try bleeding edge emulators and stuff you may be out of luck. Also all those PSP downgrader tools etc are for Windows, so you'll probably want VMWare or darwine if you run OSX. For day to day shit like browsing the web and IM, I find it really nice to use. Lots of good apps, emus, and tools (especially for hacking) are ported to OSX.

If you get the latest version of osx86 then chances are not a lot of drivers will be out for it. There are lots of different distributions of osx86 by different people, make sure you get the right one for your system. There are Intel or AMD versions, and some include extra drivers and kernels and some don't. The more included, the more chance you have of finding something compatible with your hardware. Look on a hardware compatibility list on http://www.osx86project.org/ first.

> and the fact that i have to format a partition for it?

You might as well just run it as your main OS, dual booting is possible but it's going to be a pain in the ass if you have to reinstall Windows or something.

If you have hardware close enough to a Mac then it's best to use the EFI loader, if not then you can't really update kernels unless you download a patched one, so you can't use Apple Software Updates.

Everything runs fine though once installed and it's just like using a mac. The only bitch is if you have incompatible hardware and can't get sound or accelerated video or something, but I haven't had that problem. It's cheap enough to go out and buy hardware equivalent to an iMac, you could do it for $200 easy. Might as well just have a separate dedicated machine.