Excellent choice
After recent experience I decided that more freshwater capacity was needed on my sailboat - however there was no easy, regular-shaped place to put a rigid tank. I selected the 100L model expecting to perhaps get 50L of usable capacity when placed at the bottom of my cockpit locker. After replumbing (as feeder to my existing tank, combining vent - note, reversing from how shown on manufacturer diagram) I have got an additional 80L of usable capacity for a total of 130L (35 US Gal) of capacity - and still have most of the locker space usable. The tank material appears robust and I feel confident in the construction and installation. An excellent, cost-effective solution.