I've been keeping an eye out for Finalmouse since it's release, but the quality control worries me and I really don't like dealing with RMA.
Reasons why FM is the only mouse on the market that fits my needs:
It's big and wide enough to not cramp my hand. It is super light while being so large. It can handle way over 4m/s swipes that I consistently do. I play fast paced quake like games with 58cm/360. Great sensor performance.