We have a couple of their sets on CD. I really like the Imagination Station stories.
There's another guy out there, Ron Hamilton, who has a series of Patch the Pirate stories. They are way more evangelistic than Odyssey and their humor and stories are just as well written.
Whenever I come home from school (January, May, and August) I try to have a new Odyssey and Patch the Pirate adventure with me for the kids.
-Kevin
At 2 and 13, my boys are sort of on either side of Odyssey, but I'm sure we'll pick them back up soon enough.