I've just received a pair and am breaking them in. So far, I would say your fears of dryness from the metallic tweeters are unfounded with the M40. I would describe these speakers as extremely smooth and musical, with plenty of detail but not analytical. Bass is quite strong. I have not noticed any boominess, but I wouldn't say it's very punchy, either. My SS integrated amp is fairly modest in power, however, so I cannot judge if the bass response would be noticeably quicker with a better amp, although I suspect it would.
