Base on the customer comments it looks like a great product.

Here’s the most useful Amazon comment:

BEST for color-treated hair
I highly recommend for anyone with color-treated hair. AND it gives great volume for my fine hair. This shampoo is very concentrated, so you won’t need alot of product (ie. “goes a long way”). The salon I go to sells this for almost $9 more than Amazon, so you won’t find a better deal than here. DO allow for slightly longer shipping though.

And even the most negative comment is not that bad.

pureology seriuos care volume shampoo
I was looking for a shampoo that would give volume to my hair. This product was disappointing. It’s not any better that the shampoo I’m already using for half the price.

“Dr. Bronner – Pure-Castile Soap Peppermint, 1 Gallon”

“Been loving the Bronner’s for some decades now. The peppermint has only recently been toned down; now I can put it on my nether regions and not tingle to the edge of wincing. If it’s too strong, just dilute it in the bottle; it’ll still do what it does best: clean!
Yes folks, NOTHING will clean and refresh your skin like Bronner’s. Strips off all the dirt but leaves your natural oils. Pure castille soap with zero additives except for the essential oils. Makes you realize how much of a film the artificial soaps leave; dove and ivory are a joke next to Bronner’s.
It also is THE soap for hard water areas; this stuff lathers when nothing else will.
A gallon is an amazing deal, lasts forever and is about half the cost of buying the small bottles (Vitamin Shoppe has some excellent deals on many items of many sorts; check their site out). Bronner’s is also great for washing hair, cleaning counters, dishes, etc, and even brushing your teeth. Sometimes when I camp it’s the only thing I take for all of the above; Dr. B’s does it all.
The only problem is it’s no good for telling your kids you’ll wash their mouths out with soap; it kind of tastes good!
I also love the almond soap, maybe even more than this one. Lavender, eucalyptus, lemon, etc; all are good in their own way. Try ‘em all and find your favorite. You’ll never use another soap again.
Bonuses include the most entertaining writing on any product label ever; old Dr. B was quite a philosopher and humanist, and his thoughts are special , and written in a unique style indeed.
As well, his family gives away most of their profits to various charities, and his son, who now runs the company, is a wonderfully friendly man who will talk to you and tell you some great stories if you call the company.
This is capitalsim, and soap, at its finest.
Long live the Bronners!”

See the rest of Amazon’s Top 10 Organic Shampoo