I've built two, one a clone, and am building another. The first one I built in the early 1980's and flew it many times. I still have the shuttle, but the booster bit the dust with a C5-3 CATO. The second one I built in 1994, and flew it a few times. Unfortunately, a scout stepped on it crushing both gliders.

Both flew OK, maybe 15 to 20 seconds, and tended to land close together.