I got this yesterday on Wiiware. It's freakin AMAZING! I've already beaten it after 4+ hours of sheer skull-beating-expletive-shouting-TV-flip-offing rage and irritation, but it was totally worth it.
It definitely capture the spirit of old-school game design. to-the-pixel jump gaps. Level memorization, fast-paced reflex-based boss fights, and finite lives with the fear of starting all over again if you lose them all! In essence, exactly as it should be for a Mega Man game.
Anyone else got this? Thinking about it? I give it, for a Wii DLC game, a 10/10, it really works and they did everything they should have, plus modern features like achievements and online ranking boards for time attacks. And unlike most DLC's on Wii, it's worth playing more than once for a change