I love working with Mogami, but I've had more issues with it in the field than any other brand. The cable is flexible and easy to work with, but my issues have been with the shielding. When running mogami anywhere near power sources, I end up with big issues with hum and buzz. Also, they seem to be more susceptable to cellular interference when that musician decides to just silence a phone rather than turn it off.
In every situation where I've had a buzz issue, it has been solved by moving to Canare, Sommercable, or Belden (Whirlwind). In general, Sommercable is probably the current favorite for me- jacket is flexible, shielding is fantastic, easy to solder... Their multipair, though, is anything but cheap.