Actually it will exclude you from getting some peers. Shure? Which ones? µtorrent simply jumps back to non-uTP if the others client don't support utp. Also I can't see any option in the settings to force uTP. BUT, when µtorrent introduced uTP with Version 1.8 it gave higher upload and download rates to other uTP-Users. So not using uTP would have slow down you donwloads. I don't know it its still the case with newer versions.