Here's how to do a proper scientific test on ESC response using common available hardware:
You should see very fast, small oscillations, keeping the arm level. This is good.
If you get large wobbles, or the arm drops, or the motor stalls etc, the ESC response is crap. If someone feels like making this kind of teststand and running through some common "overpriced" ESCs I think that would be great way to identify who's just slapping new stickers on hobbywing ESC.
Also see this post: http://www.rcgroups.com/forums/showp...postcount=1801