Gp patty was a great kit for me as far as fit and finish.
Hanger 9 Edge 540 was also very good.
Vector Flight 300 extra is the best by far to date, service is unbelievably good.
Graupner 300 was very good.
Worst? I built three Thunder tiger trainer 60's when I started, all three were crap IMO and all three died in a dive because there was so much flex in the elevator push rod.
No, I didn't crash all three.