They are uncomfortable if you have quite a muscular backside, because it grips above the butt cheeks and when you sit down it's like WEDGIE DEAR GOD WHY WONT YOU JUST MOVE LIKE NORMAL MATERIAL SWEET JESUS THIS HURTS -
Anyway, I am 'minority of the time.' I only wear them if I am wearing something that I don't want a Visible Panty Line on, such as tight trousers or a bodycon skirt/dress. I don't run around clubs with my skirt around my head, flashing my undies to passers-by, so this really doesn't change much, though every now and again you may see me wince as I sit down.
There you go, guys. TMI.