I would be very leery of their 30 year warranty. Go over it with a fine tooth comb. Is it the pool manufacturer or the shop's? How do you use it if you need it? What pitfalls does it build in? "Warning: Warranty is void if liner or pool wall is exposed to UV rays!" would be an example of a way to make a warranty worthless. Who has them installed and what do they say about them?

Carl