You've always wanted to have a lot of diamonds no matter what part of minecraft you're in. skyblock, survival, factions, etc. This, is ONLY diamonds. You have to trade diamond blocks for materials, even then there's only such limited items, so you have to use the duplicator which duplicates diamond blocks for fuel. You also are limited 16 blocks in space. Guess I get the rest of the world.
You don't get limited on health. So yes, you can keep your shield spot that you've wanted for so long.
Not required as of 1.0, but reccomended the uhc texture pack. ( https://minecraft.curseforge.com/projects/ultimate-hard-core-texture-pack )