As a complete package they are absolutely incredible. They do a wonderful job of eliminating that "in your head" sound that most IEMs have. Super coherent, with excellent positioning to boot (some people say that they have it the best). Warm and laid back sounding but still being able to have a little excitement to not be completely boring like the M7 (IMO)

I can only compare it to the Andromedas since Ive tried those in store as well, the M9s just have a more pleasing tonality to them.

Build quality, size, comfort, and accessories are all also very impressive. You def get your money's worth.