I bought this because I have fine, grey hair, already use cassia and wanted the body and condition you get from henna. I loved the thickness and condition I used to get when using henna, just disliked the marmalade coloured result. I mixed two parts cassia to one part amla with water, left it for about 6 hours (as per instructions on a website which promised the result would be luxuriant hair which would be darker than achieved by cassia alone). I applied the mixture to my hair, put on a hat and left it overnight. The next morning I washed it out with conditioner. The result was that all the previously applied cassia colour had been stripped out of my hair. The hair had gone back to being a dull, cold grey. As for the condition - it was very fine and fly-away. There was no improvement and I would argue it was drier and finer than before. I know that amla is considered to be the best hair conditioner, but it isn't as good as henna or cassia.
I don't know how much of a difference the amla powder makes as I am using it for the first time. However, I mixed it with henna and landed up making the paste too watery, so I was able to leave the paste on my hair for 1 hr only. I still managed to get a good colour and it was easy to wash out the paste from my hair. I will continue using the amla powder with the henna powder.
I use this mostly after using organic hair colour. I have found it is the best way to condition your hair, remove the typical henna aroma and improve curl. I would highly recommend it as a regular conditioning treatment.
I bought this following the advice that it might restore curls to frequently hennaed hair; I have been using henna for a couple of years now, and love the colour but in the last 6 months my hair has lost it's natural wave and become a bit heavy and lank. FYI, I have quite thick but extremely soft and fine hair, kind of like a child's. .. also, about 6 months ago I used indigo, which was a mistake for me as the purple/blue tones don't suit my complexion. I waited three days after applying henna, to let it oxidise and then applied the amla; I left it on for more like 2 hours, for maximum effect (and because it was restful). I washed it out, and went to bed with slightly damp hair. Couldn't have been more pleased the morning after; my hair had much more body than it has for a long time, and some good texture back in it; it has also lost the purple tint that I don't like, and the amla seems to have given a more chestnutty brown colour to the henna which i love a lot. I'll find out tomorrow if this effect survives a second wash - I half wonder if I had some amla residue left in it, and it was acting like a salt-spray kind of - but we'll see. My instinct, however, is that it is really repairing my hair; I mean I hope the effects can be spun out, because I don't want to go back to chemical dye, just to get back the wave. my plan is to treat fortnightly, in between hennas (i do my roots about once every month). Especially happy that it has shifted the indigo, which I had been planning to have cut out in stages (I had 6 inches cut off last month, wish I had tried this first); worth it just for that. So happy that I tried it; recommend you do as well. Also as another reviewer has said, a really nice, smoothing, clarifying face mask.