I actually heard them today. I did an A/B with PMC IB2i. We used Gdis dac/ pre amp and power amp for PMC and dac and pre for MM27. They are different. The PMC offer a heftier sound and slightly more open in the top. PMC IB2i is very good, and better with a larger power amp.
I've owned PMC IB2 and used a Krell 600c. That was an exciting combo. IB2i is updated with new tweeter and filters are also updated.
The MM27 never do any kind of box sound, striking clean bass. The top (tweeter) could IMO, be more open. The speakers were used in flat mode setting. I really liked them. IMO, very musical not at all harsh or fatiguing. Not the best i've heard, but for the money, it is spot on.
Just be aware of how you intend to use them, at what distances! You'd likely not have any issues with room interference.
Also, they were not picky about position of listner or especially picky of positioning in general. My PL 300, are very much more demanding.
I should after all, look for a preamp which helps further to "set the mark" for what sonic preference i had.
Perhaps also look for a good IC and PC to set the last spike in the coffin.
You could mail me directly and ask if you'd like. There is much to say.