None actually other than PA related boxes. Having said that the M2 concept intrigues me. I could very easily convert those boxes to M2 stylee by putting in a new baffle , move the bass driver up and maybe carve a M2 wave thingy from wood. It's just a shade on the big side as is although I could do as I suggested to Grumpy.
Pricey over here though when you factor in taxes and shipping.