RE: Nitro Planes Ultimate Biplanes
Yes all of the Ultimates are great flyers and good values for the money. I have each of the available sized Ultimates.
They hold up well with one caveat, which is the "chinakoat" covering.
I regularly coat my newly build Asian Arf's with Top Flight Clear Coat spray to prevent the covering and trim from coming up with glow fuel.
I'd recommend you do the same. It's a cheap and simple fix to this problem.