Yes, B&M is the only manufacturer of floorless coasters right now.
I actually thought Medusa was spectacular.  I liked it a lot more than any inverted I've been on -- I could still swing my legs and point them out like on an inverted, but it felt even less constraining since there's nothing over you.  I would rank steel coasters floorless, hyper, inverted, "normal" sit-down, stand-up...  (Of course, I haven't ridden every instance of every type, but that's a goal... :) )
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Abandon all hope, all ye who...oops, too late.  Bye!
 *** This post was edited by GregLeg on 3/23/2000. ***