From Sig I built the Wonder, 4*40 & 60, Kougar, King Cobra and they were very good. I substituted wood for the plastic on the King Cobra & Kougar. I also built the Sig Kiwi and Mustang 450 and they are out of production but not so good. I have built the GP Sportster 40, Ultra Sport 40 & 60, and started a Ultimate bipe 40. They are also very good. All fly well. I guess it depends on the type of plane you want. I will always fly a Kougar and a Wonder and perhaps a 4*40 since our club races them I enjoy that a lot.