I found these very comfortable to wear (although very snug at first but this quickly eases off).
I tested them out on my heaviest day as that was my biggest concern and unfortunately still had leakage 😞 (but I've not yet found a product on its own that can cope with my heaviest days 🙈). If you have very heavy flow days I would recommend wearing with a cup too! On lighter days they seemed to work perfectly though :)
I would also say you don't feel dirty/wet and they don't smell. Rinsing them out can take quite a while, but any of these types of things naturally do. I love not using a pad for both comfort and environmental reasons 👍 so overall I will definitely keep using them, just with some extra support on my heaviest days.