This was being played for a long time, with my brother, my friend and I switching off and playing against each other. I would almost pay full price just for this demo. It is great. The controls are complex, but even someone who doesn't know what they are doing can learn some moves quickly and compete.
Also, go through the tutorial and you will learn how to get up from the bottom. The only move I have had problems with is slamming my opponent, but I figured it out in the last game I played against my brother, giving Rua a beautiful Hughes-esque slam leading into ground and pound.
When I started, all of my wins and losses were to counter strike KOs. Now, I am a little less agressive and win more with TKOs. Both Rua and Chuck have deadly moves. I knocked out Chuck five seconds into a fight with a flying knee.