My 300 gallon tank is in my home theater room and by far the loudest equipment in my tank was the 2 MP60's. The constant whirring sound was a source of annoyance while watching movies and listening to music.
The upgrade was very simple, and I honestly thought the pumps weren't working when I plugged them in. Then I noticed the props were spinning and was amazed at the silence.
The MP60's are now the quietest piece of equipment in my setup.
I would give this 10 stars if I could...worth...every...penny.