robbo,
magma boxes are solid.
SOL-
LID!
when i run across them, there's usually sdi and analog component/composite cards installed, couldn't tell you the brand as i never have time to look.
the only gotchas i've experienced with these things are the horrible IBM thinkpads that fox, espn and the networks ship around that operate their usually unreliable scorebug software.
magma's are one of those infrequent products in life that actually work better than advertised. shoot me an email and i'll try to answer your questions as best as i can.
zeb