Just wanted to chime in here,
Been playing with the shaders for a good while now and I think they are amazing. As someone who takes a million+ screenshots, these have really added much more dynamic to everything.
I know its a matter of taste, but I wanted to say I think this configuration is great - The lighting is much more pronounced and there is a level of grit and darkness that isn't there when just playing vanilla. I've only ever noticed framerate drops in very misty areas., with multiple player characters emanating strong light sources.
Just wanted to say thanks for this, I hope its not the last. It really transforms the game.