Justiciar
You are looking at permit types with rose tintted glasses! As a LAA inspector I have to take a more pragmatic view.
The permit system has cheap aircraft, and it has high performance aircraft, but just like the rest of life cheap & high performance don't go together.
I don't particuarly like the aircraft in question but it is far more robust in construction than most permit types and so will give less trouble in a high usage situation.
In terms of robust construction and high performance the only permit aircraft that I have seen that meets the spec is the Vans aircraft but they are not cheap.