Quote from _zombiehunter
My computer runs the pack with 150-250 fps (Win7 64-bit, i7-2600K, Gainward GeForce GTX 570 Phanton, 4 GB RAM allocated to Minecraft). Everything works fine on my side.
All I can say: Texturepacks only provide textures for your game to work with, what you finally see of them depends on your hardware, on your Minecraft installation, MCPatcher/Optifine and aditional mods. If parts of MCPatcher/Optifine don't work on your side, report it to the devs so they can fix it. If you have performance issues, you can still use Optifine for a performance boost, many of the pack's features should work with it too (as you said: GUIs, HD items, ... should work fine).
Saying Optifine is easier to install than MCPatcher is something I disagree! To compare:
MCPatcher: 1) Start it, 2) hit "Patch", 3) done!
Optifine: 1) Find your minecraft.jar, 2) open it with 7zip or something else, 3) delete the META-inf folder, 4) copy Optifines class files to minecraft.jar >>> argument "easy to install" noted as invalid
MC Patcher: open > Find minecraft folder (not automatic)(about 7 clicks ) > patch > play
Optifine: Multimc open > add mods > add > locate optifine (if organized 1 click) > done > play
personaly i think the pack should have optifine support to work, because more people use it than mcpatcher, mainly because of fps boost, but also the insane amount of customizability, but anyway, great pack, keep up the good work