Hi there! What a great present you've given your husband. We haven't done it personally but my boss did it and he LOVED it! He was in the best mood for an entire week and all he could do was jabber about his experience. If your DH loves Nascar and/or racing...he will enjoy it. My boss is already planning on going back.
As for TS at DHS, I always skip a meal there. I've seen and heard many not so great reviews about the Brown Derby (and it require's 2 TS), we weren't crazy about Sci-Fi either and the Prime Time doesn't appeal because I don't think Joe would like someone fussing at him.
I would probably give Melrose a try but it just never works into my schedule just right....
As for TS at AK, I've never eaten there either (there are so many awesome choices at the resorts and EPCOT that I usually eat there). I do have Yak and Yeti & a breakfast at Tusker House planned and I've read lots of great reviews. I guess we'll find out together on Yak and Yeti if you go that route.
I'm a whole lot of help huh...