I use it sometimes. I love it, as well. It has protein in it, though. I guess it should be avoided if you don't want protein.
I don't think it is a substitute for the real thing, but a nice-to-try item that supplements henna.
I personally don't like the color effects of henna. Using things like cassia alone or mixing it with items I can get in the store like Hennalucent or Light mountain neutral have been great for me.
I know some ladies are against these products, but my hair has become much stronger and thicker as a result of these products and I don't have to deal with the henna color or mess.
But, Hennalucent neutral is NOT as good as Light mountain henna, in my opinion. Hennalucent is sifted better, but the conditioning is not as good, to me. I don't get the same thicker hair efect that I get with Light mountain. The problem with Light mountain is that it is just not sifted to well. But, you can sift it yourself. There is a page on the HFH site (
http://www.hennapage.com/henna/how/sift.html) on how to sift henna if you need to, but I just bought a $10 flour sifter and it makes the Light Mountain much easier to rinse.
Also, cassia alone does not seem to work as well as the Light mountain or Rainbow (also needs to be sifted) henna products. That is why I mix them with cassia and I have just fallen in LOVE with my hair at this point.