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I used to play on a MF3B. I was playing it on a St. Pete and it worked well. I switched to a 56J and I didn't like it as much, but now that I am back on a larger german horn I might should pull it out. All in all, it is a good mouthpiece; the rim is wide and rounded so if that is what you like, go for it.
my $.02, cheers,
Keegan

Currently, I use the MF3B and 3 on both my CC tubas (3050 & 188) and the MF5 on my F (B&S).

I use the MF3 most of the time on the CCs because of the expanse of sound. I love the sound on our recordings. If I need more bite (edge) to the sound the 3B provides that. Works for some stuff in the quintet setting better than the MF3.

The MF5 on my F is nothing short of remarkable. I will be performing the RVW with a local orchestra in October and I feel like the MF5 is freeing up to make music instead of anticipating the minor inconsistencies of my very old F tuba.

While none of the MF mouthpieces have not fixed the intonation inconsistencies with my equiptment, they bring them closer to center. For example; most of the time I can play 4th space g 1st valve (not 1&3). I don't have to pull the Eb so far out on the Willson, which makes rapid Eb to Ab passages more fun. The 188...'nuff said.

As far as the heavy-weight debate goes, I don't play these mps for that reason. I play them because they are engineered very well and they work best for me (I have a lot of mouthpieces).

Tom Gregory
adjunct instructor of tuba
Rhode Island College
freelance musician