specified stabilizing system for new build 84m, 15m beam is an active system with anti rolling tanks. I have heard of various projects where the performance of such systems was low. Who has experience and can compare water tank systems versus fin systems? Performance (reduction factors at anchor and under way), energy consumption, noise & vibration, reliability? I assume that system costs and maintenance costs are less with ART. Can you confirm? Thanx. Juergen.