epsxe can be a huge bitch to set up, namely the D3D & OpenGL2 plugins because you need to set them up just right to get them to run properly if you have a slow computer. Randomizer's right though; your computer should run SNES and PS1 games without a problem, but epsxe takes a lot of trial and error to set up, and even when you get it set up properly for one game you sometimes have to fuck with the settings again on a game-to-game basis.
Also, my main point about piracy is that while it is technically stealing, I don't feel bad about it at all other than the DC games I burned when the DC was still alive. It's not that I'm justifying downloading ROMs/ISOs, I just don't care and I'd rather not pay thousands of $ for old games when I could play them on my PC. Also CPS2 arcade boards are not cheap and you have to worry about shit like battery replacement and all that crap. Emulating it on MAME, or buying the Saturn version are the only options I would consider for playing CPS2 games.(xmvsf in this case)
I also own the vast majority of the PS1 games I emulate and usually use emulated copies as backups, plus playing them in high resolution in epsxe is pretty awesome. If I can find a used version of a game I want at a reasonable price, I'll but it but if it's expensive as shit, fuck that I'm downloading it. Emulation, other than being awesome, has the added, unintentional benefit of preserving lots of unknown games like I said before. I'll end my ramble here but in short I sleep fine at night despite using emulators since 1998.