Use:
If you like Jazz sounds.
Clarity:
I tried 6M, 7M and 8M with the expectation that my favorite would be the 7, but 6M suprised me a lot and won the contest for me. It is super free blowing, colorful in full range, kinda mid humpy sound. Basses are there but not to the level it makes the air heavy and muddy, trebles have edge but no ear tearing, just fat warm good mid projected sound.
If you look heavy dark bass, 7 or 8 maybe better. If you look too brightness small chambers and steep baffle better, but if you look this fat warm mid pitches, it is where 6M shines.
pros:
Very colorful, good projection, warmth, fat sound, no air resistance, suitable to any type of reeds.
cons:
Needed to pay extra money to buy ligature and cap. And the cap is not gold plated, it is like basic black cap.