I have been running CMB 90's in my twin for 2 years, I got out of Picco's because I couldn't get the parts I needed to keep them going. I run 50% and have since day one. In the two years I have had to replace only 1 piston. I do replace bearings about every 6 months as a precaution, doesn't everyone? By the way, the boat runs faster with the CMB's and seems to handle the water conditions better due to the extra weight.