Whatever brand you get, it might be wise to ensure that you are not getting a first run of new production model. It appears to me it takes several months and a couple revs of ECU software to get the bugs ironed out. I do like the small size, weight and cost of the K-100 and it's all internal components, etc.. Also, the ECU is mostly end-user programmable, However, it's thrust is down a bit from the P-90 RXi that I currently have.That would be the hangup, for me. Comparatively, for me, the service for JC and Kingtech is a wash. I would have to ship either away for at least a couple weeks.