Not really, I just don't find "backbone" particularly useful in the lather making process.
You paint back and forth and it wants to flick soap everywhere, you run circles and it takes an hour to build lather and cover the area. You use more pressure to speed the process and it is less comfortable than it need be.
Simmo 10 overcomes this limitation via prodigious size, smoggie splays nice and the frankshave...well that thing can barely stand up under it's own weight yet it builds lather fast and effortlessly.
I'll leave these plenty'o'backbone brushes to those who get off on horsehair shirts and self flaggelation