Anyone used Coherent?

[Dave Lord]

I am looking at an ad for Coherent from Mark Williams which claims to
be a 'virtual clone of Unix' and offers some advantages over Unix,
notably it uses less disk, memory, is easier to install, easier to learn,
and best of all, costs only $100 dollars. So the question of course,
does this really look like Unix? Which Unix? What is it missing, or
what works differently? Does it include 'curses' how about the
'regexp' and 'regex' routines. Will stuff I write for Coherent
("C" and shell scripts) run on Unix and versa? Who killed Laura Palmer?