I have been using this product for about a month. I have mild to moderate rosacea and started using it during a bad flare up - I had a lot of redness, pustules, and broken skin. I think it has really helped. I have been doing a lot of other things to calm my skin as well, but I think this product has had a significant effect. I do find it leaves my t zone very oily, but it doesn't break me out, it just looks not so nice. I use it morning and evening, after washing my face. I'm using weleda almond milk cleanser - very mild. I'm also using uriage roseliane moisturizer during the day, on top of the rosaliac serum (needed extra moisture on the parts of my face that get dry). I've also started being better about using sunscreen (zinc based), and that has really helped my skin. I will definitely keep using this product.
Edit - I first wrote this review in February, and now it's June, and I'm on the same bottle of this stuff, despite using it morning and night, every day. So I think it is great value, for the price. I'm also consistently really happy with how it is helping my rosacea. Since using it regularly, I've only had one flare up, and that was when I stupidly got a lot of sun on my face with no SPF on (this is compared to 2-3 flareups per month before). I am so pleased and relieved. (Here's the rest of my routine, in case it's not just this product: I use weleda cleansing milk to wash my face every night and some mornings; I use this rosaliac morning and night; I exfoliate with Fab radiance pads 2-3 times a week; in the mornings I supplement the rosaliac with Uriage roseliane anti-redness cream (only on the dry parts of my face, not the t-zone); about 3 weeks ago i started using Clinique SPF50 daily UV protector mineral sunblock, every day - it's amazing. this combo of things seems, fingers crossed, to have really calmed my skin down.)