I have about 55 flights on my HSD viper with a K60G. Other than the stickers peeling off after about 40 flights, everything else is holding fine. I did have to glue the rudder to the fuselage after the 52nd flight because I started to see play and I was worried about flutter. The elevator and main wings have spars and they are rock solid with no play. The airframe is holding up fine and I am sure I will reach 100 flights within the next few months.