I have a contact that said the new SY sets featuring Iron Man are not pretty solid, the pieces are either loose or too tight. Maybe with glue it can be ok. The most solid bootleg set I saw until now is Bozhi's Batman/Freeze set.
Maybe the SY sets' issues only concerns the very first packs produced. I hope we gonna get the instruction leaked soon, so we can see if it would be better to buy pieces on LEGO Shop then build it or buying those stuff.