Hello; I prefer the Sig kits, from a builder point of view, the Mid-star 40 is my favorite, with the 4 star 60 second. They just fall together perfectly aligned and make a great flyer. I have also the Sig spacewalker II, another fine kit. I have built all the Goldberg kits, they are fun to build and all fly great, except the Suhkoi 26X, I didn't like the way they attach the landing gear to the wing. Landing gear seems to be a weak point on GB kits, I replaced the gear on my Ultimate and my Extra, it's just not tough enough for our grass field. I also had fun building my Morris hobbies Gee whiz Bee, another great flyer. I have built 5 or 6 great planes kits, some good some not so good, but none were as much fun as a Sig kit.