I like my k2-120. Quiet and consistent. Has never overflowed. Cup is easy to remove. Mostly titanium hardware. There was a washer on top of the bubble chamber that rusted after a year. I just removed the washer and reassembled without it. I got mine right after they were released so maybe they fixed it. Disassembly is easy, but not tool less as it requires two sizes of allen wrenches (one for the base screws and one for the pump mount screws). The Sicce pump lasted about 2 years until the housing around the impeller cracked. I think the intake got plugged up with algae and it overheated. Replacement pump was only $70 direct from Coralvue.