Let me start by saying I'm not an audiophile, so talking about the peaks and lows are not going to be talked about here.THE GOOD1. Really good battery life. I use these in an office setting and I use them intermittently. When I got these, I charged them and used them around the house to test them out and then took them to the office. I've had these for going on two weeks and have charged them once. That's probably around 40 hours of use over the two week period and the battery wasn't dead, it was low.2. PHENOMENAL range. I have other blue tooth headphones, and I can tell you these have an incredible range. Through walls, down the hall, if I were to put a distance on these, I would say they reach at least three times as far as any other headphones I have.3. Comfortable. I can wear these for hours on end and they don't hurt my head or my ears. I have buds that I paid the same (if not more) amount, and I can't wear them for more than an hour before they start hurting my ears.4. I can have them connected to my computer AND my phone - this is the reason I bought them5. Sound. The muffs are comfortable AND they do a decent job of cancelling out the noise. Music from my phone can be turned now to near minimum and it still comes through loud and clear.6. Oh, and a really cool feature? Pausing your music when you take the headphones off. It's a small feature, but really cool7. Pass through mic. This does work, and is pretty cool. You can turn that on, have a conversation (or listen in on a conversation) without taking the headphones off. (see item 2 of THE BAD below)THE BADSo, all that praise, what's the bad? Well, that deals mostly with items 4 and 5 above.1. The connection switching between the computer and phone isn't as seamless as I'd like it. I often work in a terminal which emits beeps when it doesn't like what I'm doing, that interrupts the music from my phone, which is what it's supposed to do, but it doesn't switch back immediately. It almost seems like it needs a time out to switch back. Now, it could be the order that I paired the devices in, and it's not enough of an annoyance that I've investigated it further.2. These are supposed to be ANC (Active Noise Cancelling}, but I can't seem to tell a difference between when I have the headphones in normal and ANC mode. HOWEVER, the muffs do enough natural noise cancelling that it works for my environment. When I turned on the ANC while my office mate was on the phone I couldn't tell a difference in the noise level of his conversation, but I also couldn't understand what he was saying (but, he was speaking Chinese, so there's that). These may work better in a noisier environment where there's more noise to cancel.THE UGLY or MEH1. This is probably a driver thing, or my computer just sucks, but, sitting right next to the computer I will get occasional distortion (glitchy digitization if that makes sense) when listening to music. I have not experienced this with my phone, so I believe it's an issue with the computer.2. When first pairing (for example I started music on my phone and then turned on the headphones) the music is a bit glitchy for a few seconds. I don't consider this abnormal, but it's worth mentioningOverall, I'm very happy with these headphones, I believe they're worth the price and would definitely buy them again.