I have Alesis M1 Active Mk1s in my project studio, and M22s in my living room. Other than room acoustics, I get no surprises when moving between the two. I would guess that the M2s would be excellent in the near field, and plenty flat too.
When it comes to reference monitors isn't really isn't how good they are, it's how well you know them. So when you listen to a track produced by someone else, you can compare your own to make sure you're getting the same type of sound.
That said, I spend a lot of time working with headphones. Open back are great for bass response, but bad for monitoring with vocal recording (too much sound leaks, and will be picked up by the mic). Closed back are a bit weaker for use on the production side, but best for vocal monitoring. Having a limited budget I got a pair of semi-open Beyerdynamic DT 880 Pros. They are a compromise in both cases, but a pretty good one. The Pros are a bit hard to drive (they have an even higher impedance version too), but while they are quiet when plugged into the jack on my mobile, my audio interface drives them to any level I want.
With a good pair of reference headphones you can get the Focusrite VRM Box, that uses speaker and room modeling to give you the ability to preview your mix in a lot of different situations. That's one problem with headphones, the stereo field is greatly exaggerated, so you need to hit speakers sometimes (but if your near fields are very near, as mine are, the same problem exists there), the VRM Box helps judge that too. I drive my Box via the S/PDIF out on my audio interface, it still needs to be plugged in via USB, because the sound passes up the USB cable, the modeling is done in the computer, and then passed back to the box. There is a pretty large latency gain there, so it isn't useful for live recording, just playback.
What style of music are you planning on producing? (I'm into EDM.) Also what else have you picked up hardware and software wise?
Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs