They have worked out well. I have a pair running here in my shop and a bit of info in the parts section of my web page. They are not rock speakers that'll flex the walls but are very nice to listen to and can run with very low power. The last while I have run them with my 2A3 amps (3 watts) and before that with PP845's (more like 50W and more than needed) which we also used to display the speakers and other gear at the VSAC show last fall in Seattle.
It is a rather expensive thing to experiment with so I suggest if folks are interested they try and get a listen first - it is a good excuse to drop by Mr. Furuyama's shop in Tokyo or by my place here in Vancouver! Furuyama is usually at CES - although I have not spoken to him about this comming year.