opjose,
If you're looking at the 46size Ultimate, you ought to do a search on these forums for a couple of long threads about that model. There is at least one thread on the aileron rigging. It's quite easy to use the silly hardware included for the rigging and modify it to rig the ailerons so they work equally. They don't come close otherwise. (might be why some people have found that model to be "snappy") And there is a thread (maybe two) that discuss the weak cabane design and how to fix that.

Fixing those two design flaws is easy. Matter of fact, the good aileron rigging takes less time to do and is also stronger.