Fiberglass is Better Than a Concrete or Vinyl Liner Pool Lifetime Manufacturers Warranty Exclusive Custom Fiberglass Pools Tanning Ledges Integrated Spill-Over Spas Installs in Days (Not Weeks) Fewer Chemicals Needed Uses Less Electricity Smooth Non-Abrasive Surface Easy Weekly Maintenance (15 min.) Aloha Pools has a more detailed list of advantages here.