So far so good! The system has been functioning for only 24 hours, but it is exceptionally quiet! The reduction in noises alone is a vast improvement (no sound of gurgling in the pipes, opening and closing of zone valves, or rumble/rattle of the boiler heating). It's so quiet that I found myself checking every now and then just be be sure it was running. The installers did a great job with the system installation and didn't cut any corners, the system is clearly installed in a way to make maintenance easier in the future (e.g., plenty of shutoff valves to allow maintenance of sub-systems without needing to shut off everything).