I didn't catch up with 2001 until only in the last several years. I thought it still held up in the SFX department and was very impressive. The sequence with HAL reading lips WAS chilling, and it worked even better for me because I recall watching this scene in the hazy wee hours of the morning when it was still dark, like around 4am. So it sort of felt that I was all isolated alone in dark space somewhere myself, adding to the feeling.