Snoopy wrote:
but the performance figures are similar to 300hp SEPs
Depends what you are looking for in terms of “performance” 
It would be like comparing an old, but powerful, station wagon with a MX-5 or some similar small sports car. Same “performance”, but vastly different driving experience and appeal.
Anyway, the Subsonex is essentially a Xenos motorglider, or perhaps more like the earlier Moni with shorter wings and a jet on the back.
