Until very recently, the Shout set was $104. The extra $24 bucks gets a 4K scan for Part 5, Part 3 in 3D, and tons of new extras. I'm not a big fan of the series but I might even pick it up myself if it goes down again
Why would anyone buy this over Shout's release? On that set, the first FIVE (not four) films (including 3D) have 4k remasters. Plus new commentaries & other fresh extras.