Sorry to bring up an old-ish post, just going to add my input.
I have a TRI with HobbyWing 20A ESCs (Flashed with BLHeli FW) which works fairly well, however VERY RANDOMLY one motor will briefly stop (which usually means a crash, or if its over 2m in the air I can save it). It is so random that it may happen every minute or once a week! I've put some RF filter on the ESCs (slightly better) and there are no vibration issues as I've spent a while removing as much vibration as possible. I have even set the Gyro filtering fairly high and it flys VERY stable, i don't have a video of the issue but here is a video of how it flies (note this is loaded with FPV and a GoPro (all separate batteries)) (
http://www.youtube.com/watch?v=hvJTgLKssbQ), very weird that a motor twitches. Min throttle set to 1200 (which is nice and fast)
I've just updated my MultiWii 2.1 with this patch:
http://goo-apple.appspot.com/article.jsp?id=b483a234-68bf-4655-b4d0-d57d674e7a2f (I think its based on the fixes here) and so far so good! Not had a hiccup yet, but I need to test it for a number of weeks to make sure.. I've heard mention that HobbyWings can only do 432Hz (not 490Hz as multiwii uses) and so hopefully this has now sorted it
don't go out and buy these ESCs, I'm just giving my personal experience and it may be different for others!
Thanks guys, keep up the good work!