System is installed. Still have some finishing touches that need to be done, but nothing urgent.
I'm only using one of the ring diffusers, currently set 4' off the bottom in 15' water, on a stand made from 3/4" PVC pipe and ballasted with two 8"x8"x16" concrete blocks.
I've been running it manually. Still need to install the vents and cooling fan in the Rubbermaid chest that I'm using for a dry box, so for now I just remove the lid while the pump is going. Because of that it's not really on a proper schedule, but I started it up slowly, and have been gradually increasing the run time. It makes quite a boil at the surface. Haven't noticed any stink while increasing the run times. Pond has only been full for a few months, so that's no surprise. It seems the diffusers do have a check valve, as it only takes a few seconds for the boil to appear after starting the pump.
Last checked water temps on Saturday. Had 77° on the surface, 75° at 8', 68° at 9'-10'. Probe has a 10' lead so that's as deep as I'm able to measure.
So at this point I'm gonna say so far, so good.
Future plan is to add a diffuser hose around the perimeter of the dock for winter aeration. Should only be needed intermittently to keep the dock from icing in.
Durability will take some time to prove/disprove.