I use unsu as one of my tournament kata and don't find many problems with using it. It is a difficult kata to learn, because of its many angles. I think that the worst part of using unsu in a tournament is that if you mess up at all on the jump, even if you do a perfect kata otherwise, you'll lose. Then again that goes for any kata with a jump. Well anyway sticking to the subject my favorite katas are heian sandan (since I had so much difficulty learning it in the beginning), empi, gojushiho dai, and unsu. Aiko