I like that repros exist. I don't like emulators because they don't feel authentic enough--and what's the point of having real hardware if you're not gonna use it?

What I don't like is the whole "donor cart" thing, and how for every repro made there's another game lost forever. This is okay when its something dirt common like Super Mario Bros, but I've heard of people using fairly rare games as donor carts (someone on these very forums once used Bandit Kings of Ancient China as a donor) and that kind of thing just scares me.