I have owned my house for four years now. The toilets have had hard water iron stains and rings in them from day one. I've tried any and everything I could possibly think of to try to eliminate them. I've been completely ashamed for people to even use them for fear of them thinking I simply don't clean my toilets. Ring X was literally my last resort before replacing the toilets. I was SO excited when these actually worked!
I wish there was a way I could post the before and after pictures in this review! It is an awesome product for hard water/rust stains in toilets.
Bottom Line: Yes, I would recommend this to a friend