It might be me, but the cup has spilled from the back a few times. I don't fully believe that the stp is at fault as i might be rushing the learning process, the only immediate downsides I can think of are that, one, the balls have gotten a bit more flat, it's nothing bad, just an observation. Two, the paint rubbed off on the first day but it still looks amazing. Lastly the cup is just a bit too small which could be a problem for some, and I need to position it unnaturally low for it to work, but still not problem for me yet as id be at home or in a stall, not a urinal yet, even then I don't think most guys would look.
