What I think of these these types of products has little consequence but since you've asked I'll tell you. I'm ever the skeptic but there are a few things I know. There is no Easter Bunny, taxes don't take a vacation and rust doesn't sleep.
I've used way too many products over the years. I don't believe ANY sealant is good at a year out let alone beyond that. Even if someone were to give me a product with this claim I wouldn't go 6 weeks without putting another coat of something on my vehicle. The outrageous claims of durability just seem to be beyond reason to me. Having said this I believe that people who typically frequent sites like DC are interested in the time they spend, the process and frequent nature of detailing a car. They don't detail and hope not to touch it again for a year, this isn't even what they're looking for in a product.
Show me any regularly driven car one year after it's last application of wax or sealant, give me a piece of clay and let me look at the finish in the light. The finish will not feel slick, there will be contaminants in the paint (evidenced in the clay) and swirls will be visible. That said, what type of protection do these claims substantiate? Is it simply that water runs off of the hood? Claims such as these make me lose any interest in the product, I just simply don't believe it. My 2 cents.