Now that ScummVM supports Sierra's SCI games, I finished Space Quest III. I love that the designers put themselves into the plot of the game. I haven't played many Sierra games, but that is one thing I really loved about them. I love how Ken Williams showed up in so many of their adventure games.
The ending of Space Quest III was great. At first I thought I had done something wrong, and I thought I was going to get the dreaded Sierra death screen again. Then I laughed once I saw where Roger was headed.