I recently tried a setup with NHT M00 and S00 - but they were absolutely not for me. Much to strong in the upper mid and therefore not natural sounding at all. Somewhat like NS10...

They are good monitors otherwise, but I could never be happy using them... The sub is quite good, so I could use it for other small speakers though.
These are the only NHT's I've tried so far, so I don't know anything about the more expensive models...