I've been using skin and me for about two years now and my skin has never looked better. If you are thinking of trying it here's my voucher code for a month free just pay £3.50 p &p.
Http:www.skinandme.com/?promocode=LAURENS5YP3
I've found the customer service to be excellent. One of my recent dosers was a bit strong and I was having some sensitivity, so I contacted them and they sent me out a new doser with a lower strength of tret straightaway for free. It is also really easy to pause/delay or stop your subscription. If my skin is feeling a bit sensitive I have the occasional day off so I find that a doser lasts longer than a month.
I'm not sure if they are still doing it but they were also giving a free cleanser and moisturiser with new subscriptions too. Also if you share your code with family and friends you can get a discount on your following month or you can donate the money to charity.