"Emulators are good, but this is the REAL thing reborn, with many bonuses. Not only I could run many games and demos from the old days, but I also could play SID music from my PC, through Acid 64 Player or jsidplay2, and listen to it through a real SID. I installed both SID versions, the 6581 and the 8580, and U64E recognized both. Having the Ultimate II+ included is very good. Those ZIF sockets, however, are kinda pain in the ass; I had to reopen four times my case and put SID chips in place again before having them get the grip. This is the only downside I found in this great product."