The Vampire, as I recall, had moderate popularity in the N.E.
Bill "Butcher" Staubach had a half dozen, maybe more. Harold "Slippery" Brown had a bunch, too. I had just two. They flew well- very well in fact, but their weight slowed them up a bit in the turns. That heavy paper covering over foam wasn't all that pretty(or fun to apply)and most got dirty and stained after just a few flights. The idea was to offer a quick assemble ship and it succeeded on that mission.
The Butcher complained about repairs. At first, we first shoved 1/4" dowels lengths coated with Titebond glue to re-connect damaged panels. Some of them folded, so we then used lengths of vertical 1/8" 5 ply aircraft plywood, cut with grain span wise to reconnect the damaged panels. Fiberglass cloth/resin covered the joint. Yuck. So, even more weight.
When their popularity faded, built up ships came back in vogue; long tail Voodoos and a few others.
Those were the days- During the contest season,there were 2-3 fast combat contests a month. Everyone built and repaired like crazy during the week only to wreck'em on weekends.
I remember Scarinzi wincing when he saw them.His feather-weight silk n'dope jobs the Gold Standard in that neck of the woods.