I have been running 4 of the 250's for over 3 years now. Initially I hated the maintenance to the point I stopped following the recommended cleaning instructions. That is when I switched from only loving the flow to loving the pumps too. I went over 18 months without taking any of the 4 apart.
The metal cannister they shipped in makes a great cleaning container. I use a food saver vacuum bag sealed on one end as a liner in the can and fill it with vinegar. Disconnect power to the pump and put the pump in the bag of vinegar. My set up allows me to put the can close enough to the pump that I don't have to do anything with the motor cord. 2 to 4 hours later I take the pump out, let it drain, and put it back in my aquarium. Actual labor time is well under 5 minutes per pump and by not taking them apart every month I greatly increased bushing life.
I finally did have to replace a bunch of the bushings and a few impellers in the last 2 or 3 months. They came with a complete spare set for each pump so no issues there. I'll be thrilled to get another 3 years out of the new ones but, if not, you can buy new bushings from Amazon for $10 and 2 day shipping. A set of replacement impellers is $35.