Didn't work for me at all - found they left my hair utterly stripped and straw-like. However it always seems v popular on here so maybe that was just me.
Your scalp prob doesn't like SLS and they are SLS-free but there are loads more SLS-free options out there that I liked a lot better.
Plus does you hair totally need 2 washes? Your scalp prob doesn't like that either! The benefits of 'treating your scalp' with it as a first wash would be lost of your second wash then had the ingredients you were avoiding in the first wash.