I've been using the Faith in Nature shampoo bar for the last 6 months. I got it from Holland & Barrett and I can't say that I've seen any difference in the condition of my hair, although a friend of mine recently commented that it had a lovely sheen to it. But this may be something to do with the Argan oil and serum I'm using to smooth and condition the ends with.
I'm not so keen on the Conditioner bar as I find it hard to handle and apply to my long hair. I don't think it does a very good job as the ends have become very dry and I'm having to use Argan oil or serum. I've also noticed that, instead of washing my hair every 4 days, it's looking greasy after 3 days. Is it the conditioner or the oil? I don't know, but it seems that in order to save the planet by using less plastic and parabens, I'm having to use more water and electricity to wash and dry my lanky locks.
However the bars are great for travelling. I let them dry after use and wrap each one in a muslin cloth and put them back in the little boxes they came in. I aim to buy some soap containers at some stage..