I have about 2% of my current online bankroll (which is a good bit) on JMM. Mostly because it's a 50/50 fight and I think JMM learned more from the first fight than Pacquiao. In the rematch you can get JMM around +170 which is excellent odds IMO.
I have a small straight wager on JMM, but otherwise he is in a handful of my parlays. Excellent odds on him at +150-170. This is the type of fight where I would think that both guys would be around -100 cause its a damn close matchup