Phoenix, I've had the Stateline ones; they're very well made. In fact, when I went to all-black jointed on my Wintec (black saddle), I gave them away to someone. She still has 'em on her saddle, so she must have liked 'em.
I prefer the black rubber over the gray, but it's merely an aesthetic preference and has nothing to do with the stirrup quality. I have the jointed on my Stubben, too.
These are the ones I have on my Wintec: