I have purchased and used the 3/4 Bonmusica on my 3/4 violin last year. Now that I've acquired a 4/4, I can't imagine playing with a diferent shoulder rest! the Bonmusica makes me feel that my instrument is securely held in place and I have my hands free to work on my technique. The sound quality of a violin set up with a bonmusica rest is very good (as I remember hearing on a Youtube shoulder-rest comparative test). so my advice is, buy it, invest some time into adjusting the frame of the shoulderrest to yours and you'll be really happy. packing it into your violin case can be a challenge, though!
I use it for my electric violin (approximately 720 gram). The electric violin that I use is Harley Benton HBV 870FR 4/4 Electric Violin.
The violin size is 4/4, also the shoulder rest t is 4/4, but the shoulder rest is a bit smaller than I think, so doesn't fit to the violin. I added some ring to the shoulder rest to make it longer. Finally it fits my violin. It would be nice if the shoulder rest has a default way to make it longer, so I don't have to figure it out myself to put an additional ring.
At the beginning I don't feel very comfortable with this shoulder rest. But then I set it up to make it fits my shoulder and neck. It's good that I can adjust it to my shoulder. I'm happy that it's easy to set it, compared to my previous wooden shoulder rest that cannot be adjusted at all.
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