they are a bit small (stone size), bit very easy to carry around. The stones are light enough and the magnets powerful enough to keep from shifting or falling off if you turn the board.
I stuck one to the side of a metal cabinet at work and taught a few co-workers. It worked fairly well, though it's a bit smaller than I consider 'standard', I think.
Someday I want to be strong enough to earn KGS[-].
Does anyone know about the Myung-In MB600? That looks to be the best magnetic set out there. Could a Korean translate its product page at migame.co.kr?
You have probably already made your purchase by now, but I wanted to tell you that I have the YMI magnetic roll up board. I keep it at work and I play with a friend during lunch almost every day. The carrying case is very helpful.
My only negative, and I think this applies to all roll up boards in general, is that if you keep it unused in the container for months then it will not want to lay exactly flat at the corners. You can fix this by either using the board frequently or placing heavy books on top of the board to flatten it. I enjoy it.