Volume control is nice and tight, works great! This case for some reason it makes the flip lid cover pop open, so Im afraid to clip on button holes or othe areas out side hanging. I already have the Bose Soundlink II and like it quite a bit. I have several other pairs of fit flops, love them, and they all fit well. Definitely works on squats and sit-ups. Still looks great! This is my third set of these speakers. This is my third pair of this particular style of Birkenstock. I also like the fact that the carabiner is super lightweight and sleek. The carabiner is nice and sturdy enough but because of how my purse is designed, I cant really attach it so it just gets thrown in my purse higgledy-piggledy.