One downside the vinyl liners is you can't go to very high chlorine levels without damaging your liner. If you keep your water balanced this should not be a problem though. I did have a problem when I added dry acid to a vinyl liner pool once and it left an area where the acid sat that looked wrinkled. I have 2 dogs that swim daily so I went with concrete. My concrete pool builder was actually cheaper than the vinyl guy we had out. Only $18,000 5 years ago.