What do you think about "Thinx" panties? (Ladies only / TMI!)

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Okay, so I have seen several Facebook advertisements for these "Thinx" underwear (Beware - ladies only). They are considered to be "period panties" for women - and I am not sure if I like the idea or not. So I figured, what better place to get the opinions of my fellow period sufferers and ladies here at MyLot? Apparently, after doing some looking into, each pair costs around $30 and essentially their claim is that with these underwear, you do not have to wear pads or tampons as they "absorb" blood - up to a certain amount. I am not sure how I feel about this - I would probably never go without a tampon on my period, ever, but maybe as something to wear underneath during the heavier days. What do you think? Would you use something like this? One good thing is that they seem to come in all differnet styles - and they do NOT look like diapers, ha ha, which is great. What's your thoughts? Here's the website: