Actually, the 46 size has a couple of "wrongs". And they aren't minor wrongs.

The cabane structure is 2nd rate. The design that's used with the WorldModels version has fore-to-aft braces that aren't included in the NitroPlanes knock-off. Those braces increase the rigidity of the top wing a TON compared to not having them. And the struts that are included in the NitroPlanes version are bent in the middle, not close to the lower attachment points. That is actually a bad design decision as it makes the struts weaker not stronger resisting both compression of the top wing and tension of it. The nitroplanes design could have been much, much better at no difference in mfg cost, and tremendously better with very little extra cost. They obviously don't have much understanding of what they're selling. You really don't get what you don't pay for.

And their design of the aileron rigging system on the 46 size Ultimate also sucks. Unfortunately, so does WM's.

These aren't just cosmetic things. The cabane is going to allow freedom to flex under flight loads and increase the wear on what support there happens to be. The NitroPlanes model isn't going to stand as hard flying and isn't going to last as long as the WM significantly. And the lousy rigging is going to make both of them twitchier and less capable flyers. But hey, if it's more apt to snap in, then it's less apt to wear out, right.

Fortunately, an experienced modeler can easily fix both problems. It's just a shame NitroPlanes didn't have a few to consult.