The product is good, the problem is in the design of the tank and the toilet. As the gasket is new, the rubber works fine even if there is a design problem. The gasket is not supported in any way when installed so I added a piece of the old gasket to create additional support (see picture).
Does exactly what it is made for, easy installation but by far the most expensive gasket I've seen. Comes with tank bolts with black hard plastic heads to avoid rusting. Forgot to mention the most important part... The gasket seals very well and the quality of the seal enhances as you tighten the bolts.
Pros: Reliable, Easy to Install, Good Instructions, No Leaks