Great natural moisturizer/primer
This is a great product! This is my go to moisturizer/primer -- I'm on my second tube. I use it under makeup since I'm not a huge fan of the silicone-y primers. After applying, my skin feels smoother and makeup goes on better. I think it helps diminish my fine lines as well. It's also great when you just have a couple minutes to moisturize and are not putting on makeup. It has a light, citrus scent. I know others have complained about it but I actually find it refreshing and light (kind of like the smell of oranges). I even wore this while I was pregnant and my sense of smell was heightened and it was not overwhelming at all. I also only noticed the smell during application but not once it was on. It soaks in quickly and is not greasy. My skin didn't break out either. If you want a simple routine without a lot of mysterious chemicals, I'd recommend this primer.
Great silicone alternative
If you want to stay away from silicone due to skin sensitivity or simply because some of your make-up formulas don't work well with silicone primers, this is a good alternative. It feels light like a moisturizer. I typically let primers set on the skin for a few minutes before I apply foundation so that it has time to work with my skin. For this primer, apply with clean hands in a patting motion.
I've used this with just a powder foundation and it has worked well (no piling or balling!)