I have the W64, great machine. Did a demo with the M64, really nice. Twice as fast as my w64 with less odor and a built in ionizer for styrene printing. I would love to have one, but the timing is all wrong. Price is around $40K.
Midwest was offering an early adopters package which knocks about $9K off of the price with a rebate and free inks. Can't remember what the deadline is though.