Firstly, some background info. I have 3 Cab20 originals. 1 of them is a dark blue non-SP version with US serial numbers, another is a red SP version and the last one is a purple SP version. All are 2U. But the dark blue non-SP version plays differently from the other two. It is slightly heavier and feels more sturdy. Much better control especially at net. The SP versions are more "whippy" though. I strung it at 25-26lbs while the other two are at 23-24 lbs. I recently bought a Cab20 Muscle SP version and strung it at 25-26 lbs. It feels a lot like the dark blue non-SP Cab20 original in terms of weight, balance and manueverability. But I discovered that it has slightly more repulsion power. My pushes and drives tend to land about 1 foot long. I had to adjust my net shots and low serves too. Power in terms of smashes and clears are relatively the same. At the moment, I still prefer to use my dark blue non-SP Cab 20 original for my singles games (cos' I'm too used to the control it provides). I'm alternating between the Cab20 Muscle and my MP77 or MP100 for my doubles games. The Cab20 Muscle gives me a slight edge in a pushing/driving game.
err... if you like the original cab20sp, you will like this one too... but if hate cab20s, then dun even think of it!
