When I first opened these up and saw the big, cheap looking case with the left earbud on the right side and the right earbud on the left side of the case, I thought to myself, oh jeez what kind of crap did I buy and my expectations were lowered, but I am pleased to admit that these earbuds easily exceeded my expectations for one simple reason: they stay on my ears almost miraculously well. I can shake my head around like an idiot and they don't come off. This is important because I use these while working out using a punching bag. Other earbuds I have had get shaken loose after a punch or two but these stay on even while bobbing and weaving. The only time I have had them unseal from my ear is during spinning moves but they are easily nudged back in place with a gloved hand.They are also very comfortable feeling like they are almost floating next to my ear canal rather than being wedged in there and supported by that contact like some earbuds I have used. In short the hooks work great, for my ears anyway. Sound quality is good. I'm no audiophile so I can't really tell but it sounds like everything is accurately reproduced. I went to some sound check website and it seemed to pass all the tests to me but I did detect a pretty audible parasitic whine at very low frequencies ~20-100 Hz. In music though I can't detect the whine so I don't care. I can also walk away from my punching bag in the basement, go up the stairs and refill my water bottle all while my phone is still down stairs so the connectivity range seems pretty good. I can't really speak to battery life since I only use them for a few hours at a time but I have never run out.Now for the bad, first the case is very large, about the size of a full-sized computer mouse. Second, there are minor connectivity issues. Sometimes it takes a while to pair and music will play in only one of them for a second or two before the other one comes on. This is really not a major issue, but the problem is the issue comes back any time you pause for more than a few seconds. Usually I just keep pressing play and the earbuds ding and then eventually it starts working, sometimes I need to open up my bluetooth settings and hit connect again. I have also had it connecting while in the case and had to unpair the device to get it to stop connecting because it would connect again after I hit disconnect despite it being in the case. Lastly the double click to change volume controls only work some of the time, even though I double click, it often just pauses the music as if I had single clicked. I find this feature nice to have in a pinch if you're some distance from the phone but if possible I would always use the buttons on the phone as it's much easier and quicker. Play/pause however works fine and is nice to have on the phonesTo summarize,PROS:-Price-Stays on ears during vigorous exercise almost miraculously well-Good sound quality-Very comfortable-Nice, simple and subdued design-Physical buttons that can be clicked with gloves onCONS:-Large case-Minor connectivity bugs that are annoying but don't interfere with functionality-Minor bugs with button controlsOVERALL VERDICT:Great budget pair of earbuds that are perfect for exercise. Buy them if you're tired of your other earbuds falling off.