Gotta chime in because nobody mentioned American Leathers...
I have a real problem with stiff, constricting armguards causing my left wrist to bugger up, which I unfortunately have no idea is happening until the day after, then I can't shoot for two weeks. I bought one of their gloves and was so impressed with it that I decided to try an armguard. It's not fancy, but it's super comfy and well-made, with a pigskin interior and buffalo exterior.
The only complaint I could have is that it's tended to absorb sweat and get a bit blotchy, but that's the nature of the beast with soft leather, unfortunately. It's a tad expensive too, but I'd buy another.