I kept eyeing these in the store (I did not buy mine on Amazon) and finally decided to satisfy my curiosity and buy them. I am going to keep these because it's not worth driving back to the store for $8, but here are my issues:

While others stated the clips only fit around narrow bra straps, this must be a newer version. It has several variations of where you can snap it, but even the smallest "setting" is too loose on my (not-very-thin) bra straps, so the cami thing sags down the the base of the strap.

The material, which I expected would be like T-shirt material, is polyester that's shiny and looks tacky.

Of course (partly due to the slippery polyester), the minute I bent down to reach into my purse, the entire thing flapped out of my cleavage, so it was obvious I was wearing a "dickey." I'm glad I tested this at home first! I had to pin the base to my bra, which semi-defeats the purpose (if I wanted to pin things to cover up cleavage, I could just pin my v-neck or crossover tops closed).

Also, although these are fairly wide, if you're trying to cover up a WIDE opening, it's very possible for the side to be visible when you lean over at all. These would be best for covering up a fairly high V-neck, a narrow V-neck or a blouse with the top few buttons unbuttoned.

Overall, I feel that this product causes just as much self-consciousness as the problem it is supposed to address--i.e., you have to keep glancing down to check it to make sure you're not showing too much, so it's not really helping at all.

I am still keeping these because I might use them in the summer when it's really hot and I don't want to have a full cami under my shirts. However, I wanted to warn others. Wish I had bothered to read some reviews before I wasted $8.