I've never really believed very strongly in toner as a necessary or useful product. It's always seemed like a bit of a con to me.
However, I still use it, mostly to dampen my skin slightly before applying moisturiser. And this is the toner I use! I think it came for free with the purchase of 2 products or something like that. I use it in a spray bottle, so I only use a tiny amount and it's lasted for ages.
I like it, but I have no idea whether it does anything or not. I fear, not!