I am giving this cup 5 stars because of its comfort level. I use mine for my Krav Maga classes. It is comfortable when warming up doing jumping jacks, mountain climbers, sit ups, squats, and all other manner of exercises for two hours straight. Yet it is robust enough to take a full on crotch kick (or knee) with little pain. I have a couple buddies who always complain about how uncomfortable their cups are, and I laugh and tell them to buy this one. I have been using it 4 hours a week for about 4 months and it has stood up very well so far.

As others have mentioned, the sizing isn't quite on. I wear a medium in pretty much everything, 31" waist, but I bought the large and it fits perfectly.

*2.5 year update* - I have been wearing this consistently for 2.5 years of Krav and it is still doing its job well. It  has protected the boys well many times and is still holding together just fine despite all the wear and washing. It is still comfortable. I don't see how you could go wrong purchasing this cup.