Avent Niplette

Has anyone with flat or inverted nipples tried this? With my first I guess I just never realized my nipples weren't normal. And I used a nipple shield for several months and couldn't ever nurse without it. At 4 months I finally gave up and went to formula which made me feel like a failure. Now that I am pregnant with my second. I refuse to give up and I found this product online. Was wondering if anyone on here has ever used it and how it worked for them. I'm really praying it works. I don't want to go through what I went through with my first. I couldn't bond with my baby. It was just horrible!