i have seen & experienced a very wide variety of capabilities by myself & other slaves i've known. Full B is difficult for me. i tend to get ill (with a completely healthy & safe Domme) a bit later which can obviously be very problematic.

Other slaves i know seem like it's nothing all to them. I will say Golden is a true pleasure for me, but brown is a BIG challenge. However, i can think of no more submissive act than consuming brown for one's Goddess. Nothing more degrading and humiliating in my book.

In summary - brown is NOTHING like golden, way more challenging!
And i do believe that although it may become easier with time and practice, it will always be more difficult to survive.