Nerver read them as I really have no interest in those little engines at this time, not to say there is anything wrong with them or the concept. The larger engines (of good quality) run well unless someone fiddles with them..........for the most part. From what I have seen the smaller gas engines are about the same as the glow engines of the same size with a little more weight for ignition and batterys in many cases.
I think these little engines need a little more time for improvement from what I have seen at our field?