I already have the upgrade
50/10 works fine for me. I tried 105/20 but it did not make a big difference.
The 50/10 is handy for system updates and app downloads. Other than that, I usually watch YouTube videos, surf the web, use Facebook/Twitter, DSLR, and e-mail. Many webpages do warrant a fast connection, especially if they are loaded with flash or other animations.
Some of the Mac System updates can be well over a gigabyte so the fast connection is handy. And when Apple releases a new version of MacOS X, you are talking 4-5 GB per computer and I have three Macs that can run the newer versions of MacOS X. I have three Intel based Macs and the older iBook (from 2003) has a PowerPC processor. The iBook is handy for running OS 9 apps from the good old days since it can run both OS 9 and older OS X apps. Most of my computing is on the iDevices (iPads and iPhone). iOS updates can be time consuming on a slow connection as well and I generally do App updates on the Comcast connection as opposed to the VZW 4G connection due to caps.