For .40 and .60 size planes, these cheap chinese motors are doing pretty good. Lots of positive feedback.
For a larger high dollar investment like the Giant Reactor or any other 50cc bird, I went with a proven platform in the Castle HV110 and Hacker A60. The larger ( 50cc ) size cheaper electric motors are still having issues with throwing magnets. Also quite a few have a bad design in how the prop is bolted on. Its to easy to overtighten the prop bolt and pull the shaft in the motor causing the bearings to take a side load they were not designed to take. Ultimately, causing failures in a very very short time.
With the price of LiPo's falling faster than our economies, .40 and .60size planes are now more cost effective to set up electric than with glow engines and fuel.