I'd say it's a good thing offering emu stuff for download 100% legal on a pay basis.
People can download and play legitimate and the authors get money for it.
Problem with it could be that it gives the old manufacturers incentive to aggressively pursue free alternatives such as remakes of games.
I just hope they have a way of showing that you actually bought the rom. If the IDSA or whatever it's called come visiting and start throwing damages claims at you because you have roms lying around you actually bought then there'd really be a problem.