I was looking at both these engines for a build project but ended buying something with more thrust. Had I stayed in the 100 class I would lean towards Kingtech as they seem to be the one that really wants to provide customer service at a product price that's pretty good. If weight is really critical, I believe the P100 has a slight advantage but that's about where it ends. I have also been impressed with the operation of the Kingtechs I have personally seen run. The other thing I like is that both Jetcat and Kingtech seems to be continually improving their products. Competition is good. [8D]

PaulD