I've been working with the Nubatama Bamboo 1,200 grit stone for a few weeks now, and love it. For the most part, I prefer fast cutting hard stones like the Shapton glass series because they don't require soaking and you can sharpen a knife quickly. Sometimes, however, I just want to enjoy myself and not rush things, and that is when I pull out the mid grit Nubatama Bamboo stones. The 1,200 grit stone requires very little soaking.
Knife sharpening wizard Ken Shwartz calls the Nubatama Bamboo 2,000 grit stone a "magical" stone, and I agree. To me, the 1,200 grit fits into the "magical" category as well. Both the 1,200 and 2,000 grit stones behave like Japanese natural stones in that they form mud that changes the nature and finish of the edge as you sharpen. This characteristic makes the 1,200 extremely versatile because you can simply splash the mud off if you don't want the type of edge that mud helps create, or create as much mud as you like, and wallow in it to your heart's delight. I especially like this stone for working with white steel knives.
For more on the Nubatama Bamboo 1,200 grit stone go to http://www.chefknivestogo.com/nubatama1.html