I found these to be pretty sweet little speakers. They slip into and out of the pocket on my helmet easily, and they're easy to use. The Bluetooth pairing was easy to do, although both speakers needed to be out of the charger. You cannot do the initial pairing while either of them is still in the charger. Another tricky bit is that the speakers have a little plastic protector on the charging port (see photo). I didn't notice this at first.
I thought the sound quality was good. It wasn't overly tinny or too low. People who are used to a lot of extra bass would probably find that lacking here. But listening to music that I'm familiar with, it sounds good. The only downside is that since these aren't in-the-ear, other people can here them and that might be annoying to them. But then you don't have to worry about earbuds falling out and getting lost. Having them in a helmet muffles them a lot though. The seem to hold a charge well. They also seem pretty durable.
I like the case - it's slim and no larger than necessary. It fits in all kinds of pockets. It's nice that it gives you an indication of the battery level, but it's pretty minimal - high, medium, and low.