In my opinion, the big problem with the low-profile loom design is that you
are pretty much forced to use a rising-shed jack mechanism. And one problem
with this mechanism is the difficulty of lifting many shafts.

So true. It's interesting that Louet says the Megado is a CM loom :
http://www.louet.com/looms.htm I can't call it a CM unless when open,
the center of the shed is at the center of the reed, both planes of the shed
are under the same tension and no shaft can float under very high tension.
Since the shafts appear to be held down by gravity alone......( I've not
been able to try one out so I can't come to a solid conclusion on that ).
To me the biggest problem with a low profile loom is the lack of an overhead
beater and the lack of possible improvisation. I hang stuff from the castle,
pulleys, cords, weights or springs to counterbalance things and so on.
On the other hand, they do allow views over the loom and sort of meld into
the usual home furnishings like an electric organ or small piano. They may
be moved easily ( no chance with ours ! ) and mostly cost less; an important
item for a lot of people.

Happy Shuttling ! - Bill Koepp in Central California