lyrillThis the ONLY ambidextrous small mouse with thumb buttons in existence (well this and Logitech G302). That and some people are buying it for the high maximum tracking speed.
To answer your question, FK1 and Mionix 7000 are consider large size (or long). Rival is ergonomic right handed mouse. Kana is probably the closest but it's still consider as medium size and some people find the thumb buttons awkward to use.
So in short this mouse is unique because there's nothing else like it (except Logitech G302).
Hydesounds like a good mouse for ARTS/moba like Dota 2? People playing dota 1 and dota 2 has been favoring small mouse such as most typically abbysus for years except like you pointed out((claim?)) no freaking side buttons---essential for the genre.
is this gonna be available on taobao cus i don't wanna wait on massdrop or possibly get screwed by chinese customs
lyrillWith so many units coming with the stiff left mouse likely-defect, no I wouldn't recommend it for any RTS style game or anything that requires you to spam left clicks. I would just wait until the issue is resolved then yeah it'd be a good mouse for pretty much everything.