Running 3 of them together on a 150-gallon-tank, Not much to say, they work fine, there my first canisters, prior to them I always used AC110's.
Cleaned them once, quite heavy when moving from under the tank, when loaded with 3 trays of Ehfisubstrat Pro and 1 tray of Ehfimech.
I don't think the electronic service indicator is accurate, but I do like the
Auto Air Out Function that Detects and automatically bleeds off air trapped under the Filter Head.
A little pricey but so far so good.