I've stopped using emulators for classic games since I rather play it safe than sorry. Now, I just go for the real deal: getting the games as it is. Just like most of you guys, it is more realistic to play the games on their actual systems and don't have to worry about frame-skips and sudden pauses.
Although, through some exceptions, I do still use emulators for hacks or foreign games. Other than that, that is all what I use them for currently.