I have one w/a YS 63FZ. The quality is so so, the wing is balsa sheeted foam and in some areas it is not flat and this shows up in the covering. I would go over the whole plane with a covering iron really good prior to assembling the plane. Make sure the ailerons are straight, or take the warp out after gluing them in, and you should be good on a warm day without it really loosening up. I reinforced the area inside above where the landing gear mounts with triangle stock, I saw another one come apart in this area. What I originally thought was a tail heavy plane turned out to be a case of a conservative CG as marked by the designer. Once you get it sorted out it really is a fun plane. I had to put some dark blue covering on the leading edge (all the way to the wing bay cutouts) so that the plane was more visible. Good luck,

Jon