The cup of this mouthpiece is just the right width for my, admittedly, fat lips. Not to mention the added mass from this mouthpiece really brings out the warm sound the tuba has. I love this mouthpiece.

I'm currently using this mouthpiece on a 5 valve CC tuba. It produces a dark powerful sound. It does take some practice to get used to the wide opening and the wide throat. Once you have mastered your breathing with this mouthpiece you will be amazed at the deep, poweful tone it produces. I'm still working on the higher registers to produce a consistent tone, but It is getting better with each practice.

I like it

This is bar the best mouthpiece I've ever had I use it for high school marching band and I can hit everything on this. I can crank the low f and everything and even the high octave at first the high octave was a little tricky but I got the hang of it after a week or so

when I started playing with this mouthpiece not only did it improve my tone, but it expanded my range to more than 4 octaves. As a high school level musician this is above and beyond what I expected myself to be capable of and am very happy with the quality product Vincent Bach has produced.

This is the mouthpiece I've been looking for. I increases tone, makes articulation easyer, it increases volume and overall quality of sound.

It really made a difference both on the field and Inside

It has been years since I picked up a tuba, but I vividly remember. Perhaps I can even do a better job reviewing this now than I did at the time.By the time I acquired this mouthpiece, I had used several others. I started with a very standard off brand 24AW model and used that for my first three years. Developed a solid embouchure and tone, was always praised for backing our 8th grade band of about 50 with amazing dynamics and tone, very good context-sensitive playing technique (for an 8th grader mind you) on the school's Yamaha 3/4 tuba. After that year, I ended up researching equipment extensively. I ended up trying a Bach megatone 12. I noticed it allowed me to drive the fiberglass sousaphone harder and louder than the old 24AW, with a slightly lighter tone (less rich), but still thick and full of low harmonics. It helped me develop my air capacity and then I ended up trying a very popular Conn mouthpiece my sophomore year. I preferred the greater capacity of the megatone for concert situations, but the lighter Conn was more effective in larger groups where I needed a brighter tone that added richness to a larger marching band. Junior and senior year I ended up using the megatone 7 which had even more capacity. Its thick fundamental tone worked well with the other tuba player's brighter sound with a standard 18 mouthpiece on our 4/4 King tubas. On split parts he played the high notes and I hit the low. The massive air capacity was almost too much for the tuba on those low notes (like G or lower), but it really worked quite well. Another great quality of the 7 was the full smooth high notes. I actually felt more solid in the treble range than with a lighter mouthpiece. However, bigger tubas handle the airflow better. I went back to the middle school during my senior year to play the old 3/4 tuba, but the 7 bumped my air output so high that the tuba went over twice as loud as when I had played it before. Even though I compensated for the pitch shift, the tone was still rather distorted and overdriven when pushed so far beyond its linear resonant capacity (Lol sorry, I took a bunch of physics, engineering, and math classes, messes with my language). But it really did go amazingly loud. I might provide an audio example of me backing a concert band my junior year using the 7. There is also a short YouTube clip of me driving a sousaphone with the 7 during a band competition. Will likely add them to this review later.Oh, and I intend to come back and fix it later for readability. Sorry about the mess.Overall, you will probably enjoy the megatone if you like a dark, less rich sound. I'd also experiment with different versions, as well as other mouthpieces, to understand how they affect your playing and tone. But first, you should have a good base of experience on your instrument. It might also be useful if you want to achieve a sound for a specific piece.