I've been wearing these day and night for the last week with no trouble or irritation. I was afraid they might poke my skin or catch my hair, but so far they have been minimally troublesome.

I think the size is perfect and the studs are long enough for me. The diameter of the post is larger than I'm used to wearing, and my ears have been re-pierced, so it was hard getting them through at first.

I love the comfortable screw-on backs!! They are very secure. I check them throughout the day, but they've never once needed tightening.