I used to have one. Its extremely light and head heavy. Great at generating spin, mucho, mucho powerful.
If you are a good player and play frequently, it will probably start to make your wrist, shoulder and elbow have problems. It is very "non-ergonomic" and violates just about every tenent of racquets that are good for your arm.
So, that is my opinion. Oh, I really did love the single shaft, reminded me of the old days....