I have had 3 U CAN DOs.

YES, the U CAN DO can be used as a trainer IF you learn from a good solid trainer on a buddy box. If you go it alone you are dead for sure. But if you can pass a standard solo test sortof like what Bubba Gates suggested on the buddy box without getting disoriented or confused then the UCD is great. On a buddy box a UCD is fine, its even good to solo with, if IF you thoroughly learn to fly before you try to solo.