Well I think it's a good product and sticks well. It's water based so no fumes. I don't have enough time with it to give it any type of longevity recommendation. The downsides are that cloth tape they recommend using, it turns a muddy brown color under water and can only buy it in large quantities. Other than that I would give it an 8 out of 10 rating.
At one point I thought about giving somebody my leftover 2 gallons to try. But I keep using it for touch ups and I bet I can use it later on for any type of waterproofing projects.