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Paying a little bit more for a liner that you'll never have to replace is worth it! Add the Horizon pool pad and cove kit to the liner purchase and the 100% Warranty will extend not only to seam separation but to any other failure of the liner due to manufacture defects.
It is never as easy as it is made out to be. 1) Poster didn't mention that you can repair a vinyl liner in a vinyl liner type pool w/o replacing it. Most often, it will be the least expensive repair cost of any in-ground pool selection that has an interior problem. In some cases, a puncture or a small tear can be repaired easily by the pool owner themselves for the cost of a $10-$15 repair kit.