Size wise, the figures are fine and fit in with pretty much everything out there at the moment. The one I measured was 28mm to the eyes, so just over 30mm to top of head.
Be careful to stick to ones that say "hard plastic". The original corporation troops were a really bad restic - the sort where you have to slice off the mold lines as filing them just makes them furry. The
rebels in their Deadzone range have some nice aliens, but are restic and painful to clean.
Definitely tempted by the Mule and the Hornet.