Bougth one 10 years ago, took me another 5 to build it (too many kits).
It's a old design, don't build as fast as the GP version. Builders would love it tough. Construction manual is detailed and very well done, takes more time than usual to build. Plastic parts fit well.
However, it's a solid plane, construction and flying wise and it's just plain gorgeous!
Have been flying it for 3 seasons. It's a bit heavier than other .60 size planes, I would go for a .75 if you want to have long verticals.
Plane has no bad habits, stall is soft and straigth ahead, a very docile but also aerobatic plane.

I haven't built or flew the GP version. so can't comment on it.

Sharp333