I consistently have issues with the mouse freezing on me and/or disconnecting whether Im on Hyperspeed or Bluetooth mode. They feel like some cheap knockoffs. I would suggest you take a size bigger if you prefer it a loose fit. We go through quite a few headphones in our house because they get used and abused so much. The cons are the top case constantly comes off and the key hook easily opens and has come off my keys once! The numbers pad is missing an "=" equals sign. When I walk I wear a 20lb weight vest. I purchased 2, I love my spices right where I can easily find then. This product was super easy to assemble, and it fits so many items! I previously owned the M50x which I really liked but ended giving them to my nephew as a present since he needed new headphones and I needed an excuse to upgrade to the M70x :-)The two major differences between the M50x and M70x I noticed were:1) Weight: The M70x is noticeably lighter than the M50x which got me worried at first since that usually corresponds to being "cheaply made"; however, putting them on I noticed that I liked the M70x better on my head and the sound quality was awesome!