I cant speak on the 37.5% but I have the 40% and I love it, it has some of the better craftsmanship of the arf's being built. The hardware for the most part is crap(JMO) as is most hardware that comes with arfs, but I'm picky and only use what I think is the best. The only complaint I have with the plane is the canopy plastic, it is super brittle and cracks very easily. Otherwise I say go for it, you wont be disappionted. just keep everything as light as possible and you will like the way it flies.