I actually finished up my second bottle and am on the 3rd. I like them but the bottle only lasts 15 days so it's kind of expensive. I have definitely seen an improvement in my nails but can't say how much it's helped my hair as I've been on a henna kick. I plan to stock up BF with atleast 5 more bottles to really tell.
I would say if you want to try it, atleast buy 2 bottles when they have a sale to see how you like it. It's not revolutionary but I like it for now and have been consistent. Also no breakouts or anything.