I have been using it regularly since some samples I had on prototype media. I recently printed a series on production Bamboo and it is simply wonderful.
I talked with Hahnemuhle yesterday, and they asked if the fact that having a less bright and less whitened (optical brightener ) was a problem. I answered with what all serious photographers should, no as indeed it is the optical brightener that will degrade the media quicker than the pigment inks over a shorter period of time.
The surface is smoother than Phototrag, and the weight and feel different.
It gives a better contrast range, and has a slightly smoother transition into light colours. The gamut is also slightly better in most areas over PhotoRag (both custom profiles on the Z). The sharpness is at a whole new level, probably due to the smoother surface.
I still have a few rolls of PhotoRag, but if I am to buy matte it will be Bamboo in the future.