RE: Hangar-9 Ultra Stick 60 flimsy?
You might consider asking that expert what he means. And wonder why he didn't mention that before you purchased it.
I had two of the 46size Ultra Sticks and now way would I call them fragile. It would seem that H9, who is ultimately responsible for the execution of the design, knows what'd work in the larger one as well as they knew what works in the smaller.
Our hobby suffers from "insider info" like you've just gotten. It suffers because sometimes it's true, sometimes it's not. Ask the guy what exactly is fragile about that model and see if you can find out how he knows.