Re: What is good ukemi?
Just small hint about ukemi. It's good to look at tori (nage) during all uke's part of technique, including ukemi. Beside other things it helps to find good body settings during the fall (roll).
And one more thing, perfect ukemi is useless without good work of uke before ukemi. We need to be in right place in right time to be able to perform good ukemi.
And it is not only exit point of technique, but also (can be) entry point of another technique, another attack, or defense. I often seen an uke, who can be good in preparation phase before ukemi, and starts ukemi properly, but then his attention is getting low and at the end of ukemi he is not able to be ready to get his balance in time.