Today I bought an Asian Sega Mega Drive 2. According to the DP guide, these Asian Mega Drive 2's are region-free.
Yes, it plays PAL and Japanese games (although the only Japanese I have, Super Monaco GP II will play on my PAL MD anyway with an adapter).
It won't play my US Genesis copies of Art of Fighting, Samurai Shodown and Super Street Fighter II.
Any information anyone can provide would be great. :-)