I have just recieved a Bon Musica shoulder rest I had to do alot of adjusting for it to fit my shape. as I am a bit strange over the shoulders had to cut the front bolt shorter so it would not poke into my chest. but it does improve the steadiness of the violin for me. I thought I might have to change my chinrest but after a few days it all seems to fit me well. I had to take the strap that goes over the shoulder to its farthest whole and shift it a bit so that I was not raising the violin up but still getting the grip I wanted. I might still try other chin rest if I can afford to buy them or find them to test. but for now its working for me. better than the normal type shoulder rests anyway .