This was the first shoulder rest I had. No matter the amount of adjusting, I couldn't get that "perfect fit." It never fell off while playing, but would frequently wiggle off when the violin wasn't to my shoulder. The width of the padding was a little narrow for my liking and on occasion would dig into my shoulder. Overall though, it wasn't a bad shoulder rest and was generally comfortable. If you have the money, I'd suggest going for the Wolf Forte Primo 3/4 - 4/4 Violin Shoulder Rest instead. However, if the Kun rest has fallen into your hands, fear not.
Rating: [4 of 5 Stars!]