I've never used Dermatica but I've been using Skin+Me for two months for fine lines and wrinkles.
I noticed an immediate difference in terms of skin softness and smoothness (to the touch) with Niacinamide 4%, Azelaic Acid 4%, and Tret 0.009%. I've not noticed any difference for fine lines, as yet but they say it takes a few months for that.
The Tret % gets slightly higher each time. Starting off low is good I guess as I've not noticed any reaction on my face like I did with The Ordinary Granactive Retinoid. In fact, I still have some of TO left over so have been using it up on my neck, and my skin has immediately reacted again.
In terms of the amount of daily cream I think it's quite a lot. It's certainly enough for a thick covering on the face. And, once I've used up TO, it'll be enough for a good covering on my face and neck.
Sharing my code, as other's have, in case anyone's interested in signing up:
RACHELL5KJA
You get your first and fifth months for free is you use it.