Despite all the problems Naga mentioned, SADX works well on my computer, IMO it works better than Sonic Adventure on the Dreamcast and SADX on the GameCube. And that's with an Athlon XP 2800+ and a GeForce 6200 NV44a.
No copy protection is excellent. Every game will be copied eventually, so why do the developers risk getting sued for antitrust (and installing rootkits, like what happened with Sony) when the games will get cracked eventually? Sometimes, the stuff gets cracked almost immediately after release. So, all it does is cause heartache and complications. What if your original disc is ruined, and you want to make another copy? I can do that with SADX (I HAD the original discs, but lost it), but not anything with copy protection.
I honestly think all the proprietary software companies are doing everything wrong. All they care about is making money from consumers, they don't care about them at all. They can't see that Linux and free, open source software is the future, and that there are almost always better free alternatives to their software, so it's not really worth trying. One HUGE example is Microsoft.
Yeah, I got a bit carried away there, but IMO it IS the truth.