Yes, I've tried them all! Well, not all, but quite a few! And the reason I haven't stuck with one, so far, is I've been slightly disconcerted with the ingredients. That's why I tried this serum. I can't actually remember what number tube I'm on. Which says it all, I guess! Really does what it says on the tin. You aren't going to get Daisy-the-Cow lashes, but you ARE going to get strong, conditioned lashes. At first, my only niggle was that you can't see when you're nearing the end of the tube, but I absolutely love that Rumi send you an email reminder...that's extremely helpful. Which led me to think, why not offer a subscription service, so that you've always got your next tube ready? And throw in a teensy discount at the same time! What do you reckon, Rumi?