Wow that's interesting to know. I didn't know the knot would fall off. Did you soak the entire brush in water or just the bristles before you use it?I owned the SOC and after 6 months, the knot fell out. I wasn't going to send it back from Australia to Portugal so tried to glue it back in but the "waterproof" glue cracked and the knot fell out again after about a year. After more research, it appeared that others had the same problem with their SOC's so it's something to watch out for.
After the second failure, I tossed it in the bin. That said, the boar hair used was first class and broke in very, very nicely. Made and held and huge amount of lather. The handle felt great in the hand too so I was pretty bummed.
I replaced the SOC with the Semogue 620. This brush is bomb proof and has travelled with me without problems. That said, the 620 doesn't have the same quality boar bristles as the SOC does and still feels pretty stiff and scratchy after about 2 years. It is, however, easier to control the smaller loft and can easily get 2 passes with it.