Yes, my own listening and measurements confirm that the M22s have no "thinness" in the bass area. The response in-room is very strong down to about 60Hz, slightly lower around 50Hz and much weaker, but still usable down to about 40Hz. This of course means when used without a sub and without any boost from tone controls. Keep in mind that published frequency response graphs show anechoic rather than in-room results and that even as to that Ian has pointed out that the chamber isn't accurate below about 85Hz.
A good sub fills out the bottom 1-2 octaves and should always be used when available, but for most music the M22 bass is fine without it. Boosting the bass with the tone control wouldn't be a good general practice, since this actually has a maximum effect in the upper bass area and with good material adds a false "warmth" or "fullness" which some may find pleasant, but nevertheless is inaccurate. Some speakers have a somewhat similar upper bass prominance built in to give the illusion of more bass extension. With material that is bass shy the tone control can be used to reach a more nearly balanced overall result, but should be turned off when well-recorded material is being played.
