I dont know about the US40+ but I'm scratchbuilding a US60 and I
would say it would not be a good first kit.

Someone else mentioned the Sig Midstar. I built one and flew
the heck out of it and its an outstanding plane.

If your flying ability is a bit better then consider the
Sig Somethin Extra. I also built one of these and
it has to be one of the easiest to build kits out there.
Its so well engineered I dont think its possible to mess it up.

Its a great flyer. With mild throws its pretty docile and can
fly almost like a trainer. Increase the throws and move the
CG back a bit and it can do really nice aerobatics. Increase
the throws a lot and hang on. It can get really wild. Its not
a precision aerobat though. It wasnt designed for that.
If its precision aerobatics you are after then start thinking
about a pattern type of plane.

Mike Hammer