Thinx period panties???

So...I have just found out about these period panties, and am seriously interested in getting a pair and trying them out.. I consider my flow on the somewhat heavy side a couple days, maybe more just flow where u wanna go... I wear overnight pads throughout the day and at night usually leak on my underwear (Down my butt crack) .it's miserable, I now sleep sitting up in a chair most the week just so wont mess everywhere. I can't wear tampons bcuz of tilted uterus... Can any of u ladies tell me anything about these undies???... I went to their website and they are nearly $40 a pair so I'd like some more info before I fork over a pretty penny.. thanks