The problem is that many of us professional users of Spice tools
aren't likely to go to any length to use another tool just to pass it
onto SED.
No matter what others use... IF it can generate a netlist I can "play"
it in PSpice.
If you can train yourself to work from a PDF and a netlist, you
definitely can run my PSpice stuff in LTspice and perhaps in
Circuitlab... though I see no such way there at the moment.
I do note that Circuitlab is being developed by a couple of members of
the Brass Rat Club, so it bears watching (that ought to aggravate
Larkin... I will be awarded my red blazer in June
...Jim Thompson