SIG SU-31 structural failure
I believe the wing failure was overhyped on this forum as the actual failures could be counted on your fingers only, and that is out of kit runs exceeding 500 each.
Prior to assembling all my ARF's, I visually inspect each component thoroughly then go through a twist, tug and bend physical. If any part seems substandard, it goes back for replacement. Modifications come next but only if I am going to power it outside of the manufacturers recommended engine range.
My Sig Sukhoi was powered with a BME 44. No mods were made, all pieces passed my personal criteria so it was assembled. The wing could be used as a surfboard in it's stock condition! The plane flew great and survived all manuevers, good and bad, I put it through. It's second owner is still doing the same during it's second year of use.
It's only mishap occured while carrying it into the house, I tripped and fell on it, smashing the aft fuse flat between the cockpit and tail feathers. A new fuse had it in the air again in several weeks.
Check out the parts, assemble it and go fly. It is a fine model and plenty strong. Sig will handle any parts you are wary of. Use your modeling judgement and proceed.