Irvin, I have actually played a 1 piece RPM Blast when I had my pro stringing my racquet. When I started stringing I saw that Head recommends a 2 piece, so I tried both and haven't felt a major difference between the 2. (although it takes me longer to string a 2 piece than a 1...still getting used to knots and how the RPM doesn't slide as easily as others.)
The hybrid stringing feels great, almost like I didn't change to a hybrid, but the multifil in the crosses has given me a little more feel and spin. I am a Main string breaker so having the RPM in there for durability seems to have gone a long way.