Recently got mine in the air . . 22 flights on it now, and it's a great flying airplane. Just a real pleasure to fly.

It does everything easily and I have no issues with the build quality or airframe design. I think BJ knows what he's doing in that regard.
I haven't added the shim at the top wing mount, and it hasn't been an issue at all . . although I will add it just for a little extra support at the root. You can see in the pic, I carry it by the leading edge of the top wing and trailing edge of the bottom wing . . feels safe and secure.

Value for money, it's a 10/10 (if you want a Bipe).