This clip thing is really only to hide straps and used for certain tops like racer backs. I don't wear normal bras generally tho unless I have to or want to. I wear sports bras or thin sporty bra type things that just hold them in place lol but im only a 34B so yaaa not much to worry about xD my roommate goes bra-less completely but i dont like how that feels
I've used paper clips like that a few times when I really didn't want my bra straps showing with a racerback shirt or dress. As long as the clip isn't stabbing me, it's not that much more uncomfortable, although it's better if the straps are adjusted to keep them from digging into my shoulders.