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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.
Answer: The average life of a vinyl pool liner is seven years. Though some make it 10 years or longer, seven years is the expectation. If you live in a cooler climate where the pool is covered six months of the year, it may last twice as long as one in Texas that is exposed to the sun 12 months out of the year.