I would say that is a pretty good overall assesment of those cylinders. I have only ridden a serval briefly so I can't give a great review of it, but I will say it is a fun motor to ride. However, now that I have a cheetah, I can comment and give a decent review. Now, keep in mind that my cheetah is setup to drag and is sitting in a drag frame, but I honestly think I could pull my motor as it sits and throw it in a duner and have a kick ass trail motor. It has an awesome amount of power down low and up high. The kick when the power hits is not near as aggressive as other motors I have ridden which makes it very rideable and predictable. Even with my dune ported stock cylinders, I would say I prefer the "feel" of the power valve motor 10x more. Even with the little added cost, I will probably always try to run a pv motor.