I just recently picked up a couple of Matsumura White Steel Dovetail Chisels from Craftsman Studio. I got a 3/16" and a 3/8". I figured those two sizes would cover pretty much all of my dovetail needs.
So I have to say, I am impressed! They hone like butter on my Dan's. They feel good in my hands even though the handles are small. They feel delicate and precise. And they cut like no other chisel I have. I haven't used them enough to get a good feel for how well the edges hold up, but the 3/16" made it all the way through the box I was making without seeming to lose one bit of sharpness.
This is my first Japanese tool experience. So far so good.