I've had about a dozen flights on mine. In the air it flies great but on the first three landings was a dog with a death wish - bounced like crazy. Manual states CG 1cm in front of wing tube so took some weight out of the nose and brought it back to wing tube. I raised the nose gear supports 1cm further up into the fuse and stiffened the nose leg. Also shimmed the mains forward. That fixed my the landing issues. While I had the mains out also reinforced the landing gear blocks and ribs with carbon tow. Pilot cut most of the rib away for the bearers and both mine and my friends Viper ended up with cracks in the top wing skin above the mounts. We heard his crack when it was taxing out to the flight line. The servo mounts are pre installed so make sure you get sevos that fit, consider buying Pilots servo package. The 2lt tank only gives about 5-6min flight with a 10N turbine so my mate put a second 24oz tank on the CG under the main tank in his Viper. I'm going to do the same.

Rick