This is the complete collection of Rocky films, spanning all six films across 30 years. If you already own the Anthology box set there is little incentive to buy this new collection, simply because it differs very little from the previous box set. The most obvious addition is the latest film, Rocky Balboa. This film is a definite finale for the franchise, so rest assured you won't buy this box set only to find out Rocky 7 is on the way. The only other difference is with the original Rocky film, as this collection includes the "Definitive Edition" - a 2 disc set packed full of extras, that can also be bought separately.
Rocky 2 right through to Rocky 5 remain untouched from previous versions, which means they include nothing in the way of extras. This is what has disappointed many fans - a lot of people feel this is a missed opportunity and that extras should have been added. I'm somewhat inclined to agree with them becuase surely there must be some extra material on the cutting room floor that could have been included - promotional material, interviews, commentary, etc? Nope, nothing it seems. Despite this disappointment this is still worth getting for anyone who does not already own all the Rocky films.
It's also worth noting that this collection is a limited edition box set that is indivdually numbered. I'm proud to say I came across number 00051. How limited it actually proves to be is anyone's guess - I suppose technically it could go up to 99,999. Almost 100 thousand people owning a copy suddenly doesn't make it feel quite so limited.