I find the red display of the MD a less readable than my MnM and OT, especially off axis. It definitely has less contrast. It's okay when looking at it straight on (e.g. standing up and using it on a tabletop), so I'll probably fix this by getting a stand of some sort to hold it up at an angle.
It'd be nice to have LCD brightness/contrast control, or... like TrabanT said... OLED. Certainly not a deal breaker by any means.