Noise cancellation works very well. The cans are comfortable for long-wearing. The control box is somewhat awkwardly placed. Close enough to the headset that it won't sit on a desk, and big enough that you're conscious of it dangling . Either making the control box smaller, or putting a clip on it (so it could be hooked to a collar) would give these that final star.
I use these in a loud office setting. The noise cancelling works great, excellent price, but these things are big and heavy so I took off one star. I also wish the mode/mic/power selector was further down the cord so you could move around easier with the headphones on.