I've built 4 t-34's, 2 40 sized Mustangs, 1 Corsair, and my Velox. Addtionally, I've helped friends build 5 Mach II's, a couple of Ramblers, a 60 sized Mustang, and a couple of their Super Sport 40s. Generally speaking, they do a good job, on the simpler planes, T-34, Mach II's and Super Sports, while the more complex ones seem to be hit or miss. The Mustangs and Rambler were OK, while the Corsair just a little better than the Velox. I'm just talking build quality here, and of course my opinion.