Unfortunately we dont know how they are constructed "inside", glue joins, balsa vs. ply, cheap ply or what ever else. Some companies do a better job than others and some of the same companies kits are better that others. Unfortunately it makes us become "test pilots:. The only way it will ever get better is discuss it right here on the forums. When company X doesnt sell any kits because they come apart, the gear rips off on a normal landing or the linkages are crap then they will fix them. The only way we know a jet is "right" is to build it ourselves. Looks like this option is slowly going away as the kit manufacturers cant compete with the prices from Asia. The old addage.."Let the buyer beware" still holds true.