[Jake]

My observations after only 6 sessions on a Flysurfer 21m Speed 5.

Bridle more complex: triple check bridle and lines for tangles and debris before launching.
Need room for launching and landing.
Self launching and landing seems to be more difficult, but may be my inexperience.
Flagging out on the safety can produce a tangled mess. I did it twice over land and was able to sort it out in 10-15 minutes. I would not want to do it on the water.
Reverse launching easy.
Huge lofty jumps.
My 21 flies pretty fast compared to my 16 xbow.
Plenty of power.

I was going to sell it due to the first four points above, but decided to keep for light winds (8-10 knots) and possibly foiling.