All 6 of them came out when I saw it on a Wednesday matinee at the end of April. Everyone signed, stopped to chat for at least a few seconds beyond the usual "thank you", and took pictures with those who asked. Probably the best stage door experiences I've ever had. It helped that there were only maybe 5 of us waiting.
Sigourney Weaver is so incredibly sweet and asked everyone what we thought about the show and stayed for at least 10 minutes to talk to everyone and make sure everyone got anything signed that they wanted and all pictures taken.
Scratch and claw for every day you're worth!
Make them drag you screaming from life, keep dreaming
You'll live forever here on earth.