Ok, let me start by saying that this product could come open (the pump part) during shipping because for whatever reason, Amazon has been shipping these big bottles in a Poly mailer and it just does work. Its not the product itself that's to blame. I had this issue happen to me and instead of returning it again only to get similar results I reached out to the company's customer service to let them know of the issue directly just to give them a heads up. They have excellent customer service by the way and were very helpful.
This shampoo works fabulous on both human hair and synthetic extensions and other add in hairs. It lathers a LOT into a very thick, rich lather and cleans very well. It has a smell that is both slightly floral and slightly tropical, I can't quite pinpoint it. The bottle size/price may seem expensive for shampoo, but this is specifically for extensions AND it lasts for a long time. We use it to clean wigs, extensions, tape ins, crochet, braid in, and other hair additions. I really, really love this and will continue to get it because of the great quality and amazing customer service.