Yes, I enjoy my RX-8 even though it is slightly less efficient than a similar piston engine. You make an excellent point.
Since we do not have certification results a debate would be pointless. We are after-all gambling here. We are taking a risk that there will be applications where this technology excels. If you want to make 1000% + in a year or two, this is a good choice. If you want a relatively safe investment, I like Lowe’s for decent gains over the next few years….Probably not 1000%