Only reason I bought a 4 Star kit is the fact that they dont offer the 120 size in an ARF. If they had, I would have spent the extra money to buy it. I really dont have the room to build a kit, much less the time, but in order to get what I wanted, it was the only way. The main thing on ARF's is to check the glue joints good, to make sure they were all glued properly from the factory (the ones you can get to, anyway). Another reason alot of guys prefer the 4 Star in kit form is probably one of the most often modified planes out there, and it's way easier to modify things when you're building than it is to modify an ARF.