I never bought the SGU series after it went off of TV. I have SG1, SGA, and the TV movies. I started a rewatch of SGU last night with my son. I introducted him to SG1 and SGA...both of which he loves. We finished all parts of AIR last night, and I must say that I have a new appreciation for the series that I didn't have when I watched it the first go 'round. My son also seems to enjoy it.