I am on my Second year with a Polar G2+ and love it, I am also running with 1500 gallons of storage, have had zero issues with the boiler, it has taken a while to get all of my personal controls for the rest of my system to play nice with the boiler. I had an Econoburn 100 before, nice boiler but way more difficult to run, the Polar is load and go, twice a year clean the exhaust fan and every couple of days take in coals out of the reaction chamber (lower tunnel) throw coals back in burn chamber, remove remaining ashes, and good to go, I also run the easy sweep lever every time I load. Full disclosure I have some ties to Polar but would be glad to visit with you, shoot me a PM if you want to chat.
Jason