RE: Sig four star 60 or 40
Everyone of the listed reasons are definately valid. It's a great plane for flying and learing the acro. I went with the yellow ARF version, Put in a Tower Hobbies 75 and added a lateral support between the gear legs about 2 inches below the fuse. Helps with the flexing of the gear on those less than perfect arrivals. When I have to do a major wing rebuild (not if!) I'm thinking about adding another servo bay in the center of the wing and adding functional flaps, just to start learning on something that won't be real expensive when/if I bend it up some.
Clint