I have Mag Dr's. a 500gph, 2 X 1200s and an 1800. The 2 , 1200s have been running 12/7 since the mid 80s, and the 1800 since the mid 90s. The large ones are not the most quiet pumps (vibration hum), and I have replaced impellers and 1 volute, but that is a cheap fix.
I had a Quiet One for 2 years and it died, and is impossible to fix.