TL;DR version - works for fine hair without buildup, lasts well
Longer version:<br />I bought this because I have developed an allergy to SLS, and the newer ingredients that are basically the same thing.  I have super fine hair, but a lot of it, and it tends to lack volume.  My hair tends to be somewhere around mid-back, so I could it as long.  I really wanted a product that was less plastic packaging, didn't irritate my scalp, and didn't plaster my poor hair to my head.<br /><br />This product works really well, the one ding is that the soap is super slippery when wet and the teardrop shape makes it harder to hold onto than round ones.  However, the coconut derived surfactant doesn't irritate my scalp, and I've used it 6x week since I got it Jan 12th.  It lasts quite well if kept on a shelf out of the shower stream and lathers nicely.  Best of all, it works with my current conditioner and doesn't leave a residue like some solid shampoos I've tried.  I'll be ordering this again!
Rating: 4 stars