I run castle and I couldn't be any more happy than I am with it. I was running the 2650 but I recently switched to the 1800. I mainly switched so that I would have more run time. Initially I was a little disappointed since it was a good bit slower than the 2650. However after running a few laps I realized that I was actually faster with it since it was much more manageable.

I am running mine on 4s which is plenty fast enough in my opinion. With all this said I believe that Tekin is just as good, I've just had such good experience with castle that I haven't had the urge to try anything else.

Sorry for the electric talk, not trying to derail the thread or start any arguments.