I have two evo .46, one evo 1.00, and one evo .52 and I absolutely love them all. They have all ran great out of the box, and none of them have ever given me a lick of trouble. I also own a 46 AX, and it too has never given me any trouble. Overall the AX is much stronger than the evo, but for the money I find nothing wrong with evolution.
I will recommend this, though. If you have one of the trainer evo's, then take the flywheel off of it. That will get rid of some rotating mass, making transitions a little faster.