I always thought that the hype and marketing around Bio Oil was, well, BS, until I tried it myself. I received a 60ml bottle as a gift with purchase the Christmas before last, and it sat around untouched for several months before I thought hey, I'll give it a go.
I was really surprised at this product after a couple of weeks of using it! My favourite way to use is to use on healing skin - mostly dried up pimples on my face but also scar tissue on all parts of my body. I find that the Bio Oil helps my skin heal much faster than it would using nothing. It also helps to hydrate those flaky bits of skin you can get after a pimple is 90% healed and therefore helps my make-up go on smoother.
Regardless of my love for Bio Oil, however, I would recommend you buy it when it's on sale. The price can be pretty insane but I have seen the 60ml bottle at the Warehouse for $10-$12 on a good day, and that is more than enough to last you months and months if you use it for spot treatments like me.
I was bitten by some sort of insect, which brought on a full eczema reaction all over my body, and after that went away, it left my skin with dark pigments and very, very dry. I don't know if the bio oil helped with the pigmentation, but it was great for the dry skin. It absorbed into the skin very well, and I was surprised to find that it did not leave a very oily feeling as I originally thought it would.