I have a module sitting in front of me all day long and I now have a very easy way to see when my local internet connection goes down (the IO-204 lets me know). It amazing how many times a day my ISP does down. It's only ever for a few seconds at a time but still.
As for our servers... they are in a data center with a few layers of redundancy. Checking the server logs, I can see that a few users are on some very reliable connections. Their modules have been logged on for weeks without a single interruption.