Yesterday my friends and I spent... far, far, fat too many hours for me to feel anything but shame admiting, playing on any server that had population. It was crazy fun.
The goonstation servers were awesome, if sometimes bonkers (the captain threatening to throw anyone in the brig who didn't attend his birthday party in the cafeteria, which of course got bombed while we were all there...) it's just nuts! And the added features on their servers are really fun to play with, though some are a bit too much silly for me to appreciate I think, but others enjoy them. (The /endless/ fart emotes and guys in a clown costume. Really, does anyone play the clown who isn't a masochist? I felt entirely justified that my character, despite being sane in most other respects, killed the clown as often and as messily as possible >.> Or just turned him into a monkey.)
The servers weren't as hot for RP though, but every now and then a clump of people would join who seemed to collectively lower the concentration of wacky enough that you started to get a little tension going as the station started going to hell.
We would really enjoy a few rounds on a server where the RP was a bit more focused though. We did get a round on one server, I forget which one but there were only about 7 people on it, that really got going in an RP sense and it started feeling like something out of Alien. Really awesome, paranoid RP. Great fun.
Out of curiosity, what sort of features does the B12 version have?