>From descriptions I have read with the M40s I gain bass and a more pleasing sound experience.

I see M40s as fantastic standalone music speakers but for a pure HT system with a sub I would probably lean towards M22s. For a mixed-use system it would depend on the music/movie mix... I still prefer floorstanders w/o sub to bookshelves with sub for music in most cases.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8