I've had my TKO Contender for some 7 months now, and I must say that it is a fairly predictable ball to use. I haven't used it extensively over that time frame, but I have found it to be a fairly good alternative ball to go to when the lane conditions are pretty tough trying to use a more aggressive particle ball such as my Complete Chaos or my Chaos.
My TKO Contender is set up with the CG near the middle of the grip span, with a slightly negative kick on the CG, plus a little bit of finger weight in the layout, and the pin is located directly above the middle of the finger bridge. This would not normally be a drilling pattern of choice for me, but seeing as how I got a pretty good deal on the ball second-hand, with very few games on it, I couldn't pass it up.
When I received the ball, it had been through the Lustre Kleen; again, not something that I would normally do, but I tried to use the ball in this condition anyway. It didn't take me too many games to see that the ball would skate out on me severely, so I removed the wax, cut the finish back down to 600 wet-sand, and tried to get back closer to a box condition; I've since come back and resanded it with ScotchBrite, burgundy up through the gray, and am much happier with the ball reaction now.
With the longer length that this ball layout provides, I normally only use it when the others mentioned above are too strong for the lane condition. Several times, I have found the TKO Contender saving the day for me when the shot got just a little too dry for my other equipment; it gets down the lane fairly smoothly and isn't too jumpy on the dry, even for a particle ball. I'm sure that I would use this ball a lot more if it was drilled more aggressively, but it still offers me an alternative to backing down to reactive resin. One thing that has surprised me is the lighter pocket carry that this ball can generate; it's a good mixer when the conditions are right for this ball. Also, when I can manage to get this ball in the pocket high flush, it smacks the rack incredibly.