Decent sound quality and microphone quality. Very comfortable. Has mute and volume controls on the back, could be more conveniently locaeted on the cable.
The cable comes in 2 parts: one has a proprietary connector into the headphones and standard TRRS plug, the second has the TRRS socket to the 2 TRS plugs for devices with separate speaker and microphone. I wish the first was longer and the second was shorter. When plugging into a combined socket device (eg. plugging in to my laptop on the coffee table while I'm on the couch) it can be a bit short. When plugged into a split socket device (eg. my gaming PC under my desk) it is ridiculously long. There is the connection in the middle of the cable and I need to make sure the cable doesn't get caught in my chair.
Also loses points for having a non-standard connector. They have engineered a modular cable which is great in theory as you can replace a broken cable. But the connector is non-standard so could be hard to find.