Chastity and orgasm denial discussion

Has anyone here used this gadget? I believe it fits my budget. If you have, how noticeable is it when wearing clothes? Occasionally I’m too lazy to dress up and just throw on athletic shorts or sweatpants—would the device show through in those? It mentions a urination hole; since I’ve never worn one before, that opening looks quite small. Is its size the reason some folks say they need to sit down while peeing? Thanks.