Those ball-shaped Tunze pumps are not exactly high quality either.
I have two 6055 died on me, first the power supplies went and I replaced them through Tunze, then the motor blocks died within months, so i just toss them and go JeBao.
I have a 6105 motor block died, a 6095 power supply and motor died, a 6025 died, and many these ball shaped tunze had their front cover flew off during operation.
The old chuncky Tunze 6100 and 6000 last forever, the oldest one I have is about 12 years and still running.