I have flown the 60 sized KAOS for several years. It was an OUTSTANDING pattern ship. Unfortunalty it came to an abrubt end when mother earth decided to reclaim the wood in the kit. I am currently rebuilding this plane. I also have a 40 sized KAOS and I am considering the 90 (saw the plans today). The only issue I had to overcome was to not let the speed drop too much in a turn, this is what finally caused the demise of this bird (I was teaching a new pilot and I took my attention off of the plane). This thing flew straight as an arrow and went wherever I pointed it. You could also look at a "Contender". This is another real nice flying (second) plane.