The Snap-21 my favorite plane of the 80's. Plastered one when the radio quit in a airshow, never seen so many pieces of balsa and foam fly. The second one is, well still in the cellar. It is at least 20 yrs old hasn't flown in about 4yrs. I pulled the covering off to recover and found so much oil that it wasn't worth it. I was given a new kit this fall so all is well. I will put it on a slight weight watcher program and then build.
I think this plane is quite stable when flown accordingly, just can't hammer it around like the newer ones.
For that much money I would opt to go more funtana or something. Maybe look at the BME cap as they will be much more stable. However, I haven't seen another plane that will snap as true, straight, and faaaasssttt as this little cap.