Overall, I enjoy this product as part of my daily make up routine, but I use it sparingly because of the price/product amount.
I got this as part of a package in the color fair. I had seen reviews that the colors ran a bit dark/orange/warmer than my cool skin tone so I actually went out to an ulta before I bought the package online to see which color would match me best. Light looked a bit too orange for my winter skin, so I went with fair. After receiving the product I realized that since it smooths so nicely into my skin it wouldn't have been terrible if I had gone with light instead. I am, however, glad that I went with fair.
The product itself is about the size of e.l.f's studio moisturizing foundation stick (about an inch in diameter, about three inches tall), but elf's stick is more of a foundation and this one is more of a primer. Tarte's cc primer also has green and purple wedges inside of the stick itself which are said to be color correcting. I do not have major color issues, only minor redness on my cheeks, and it helped for that, but I'm not sure how well it will work for major problems.
Since I do not have skin issues, I occasionally wear it and some concealer/setting powder on days where I don't wear much make up and it does nicely as a light coverage, which is what I want. When I wore it one day under Tarte's liquid colored clay foundation, it was nice as a smoothing primer, but nothing that I wouldn't really find in other primers, especially because I have no real need for the CC parts.
Buying it on its own at about $34 is a bit expensive for me, but since I got it as part of a deal, I think it is worth it!
Edit: So I just wanted to add an update. I forgot to put on my moisturizer after my shower, as per my usual routine, and I saw some of it settle into the fine lines underneath my eyes about an hour later, like some of the other reviewers talked about. This never happened when I moisturize (nothing fancy, just Olay) so if you are having that problem, this might be a fix. I believe it is silicone based as well, so I make sure I avoid using waterbased make up over it.
Overall positives: smooth/silky on face, good color for me, fixes minor color flaws in face, light coverage/can be worn alone
Overall negatives: color range (runs dark), can settle into lines (not consistently, but it happens occasionally), amount of product/size for the price