I have not ridden or even seen one except for photos. Bamboo bikes seem like a designer/novelty thing to me. I just can't justify the price to ride a frame that is no better than my current ride, and heavier at the same time. It is definitely more maintenance than a nude carbon bike, it's heavier and probably not water or weather proof. Who needs that hassle? So the question becomes why ride bamboo, and the only answer seems to be because it is cool.
I'm sorry, but that does not cut it for me. I have many other things that I would buy first that are also cool, that I don't need as well. So why by a bamboo bike? I would rather get a DFly/DFly/DFly S&S coupled triple. Now that would be a cool bike!