I've always had trouble with ear buds as I have small ears, but usually I can find a set that will have the smaller tips and will be secure and not flop out. I got these as a replacement for a Jabra set that I absolutely loved, but had a very short life. After my second pair died, decided to try something else. The BB Associate suggested these and I expected that for 100 bucks they should be pretty good. If someone asks me, I'll give them they're, at best, Okay.
First, the sound is not as true as my cheaper Jabra's or my over the ear Sony's. As others have said, the bass is kind of bleh. Best you can do is adjust your player. Second, the smallest tips still are too large and if I don't nearly screw each bud into my ears, they pop out while exercising or even just moving around. After a few hours, I know I've been wearing them. They are not as comfortable as my Jabra's or some of the cheaper wired ones I have. If I didn't really need a replacement as I was going on a trip, I'd have returned them for the comfort, in-ear issues, alone. I'd think the volume was low and it turned out that the ear bud had slipped out of my ear. And, yes, I know how to use them. The little case that comes with them sucks. That's the only way to describe it. There's no way to close the top and they fall out in my bag. You have to get a better thing to carry them in.
On the positive side. they charge from the mic/control slide. This is way better than trying to get a micro usb plug into an ear bud as others do. They were easy to set up, hold a charge pretty well even after hours of use. Despite the bass issue, they sound pretty good (when they stayed in my ears). They didn't lose a connection if I strayed from the bluetooth device, and I like the feel, the build of them.
If you want sport bluetooth earbuds but don't want to spend mega bucks these might work for you. It's really difficult to find any that will take a beating, stay in your ears, comfortably, and are reasonably priced. You just need to have bigger ears, your own traveling case, and not care too much about bass.