Since I started reading Caroline Hirons blog religiously, I took her advice and added an acid toner to my routine. Albeit, this is the first acid I've used on a regular basis, I absolutely love it and can tell a HUGE difference in my skin. It has completely turned my skin over making it smoother, evening out my skin tone, as well as, decreasing my breakouts (or healing them asap when they do pop up) within the first two weeks of using it. I use it nightly, both pads. It stings just a hair, especially if I've used my Clarisonic or Suki sugar scrub as part of my cleansing routine first, but it's nothing terrible. I hold it over any "bleeding" zits that I've popped (correctly, of course) and it stops it pretty quickly and the spot heals within 24-48 hours.
I highly recommend these, especially for 40 and over skin. I'm 43, and I will continue to use these pads. They are pricey, but they are totally worth it if you're looking to add an acid into your routine. Finally, these are so convenient! It's so much easier to have a pre-soaked pad you just pull out to use vs having to add a liquid yourself to a cotton pad. A must have for those looking to revamp their skin!