The benefit here is that you can print out the most current approach charts for any airport (or many of them) prior to your flight. This often beats running to the pilot shop for the latest chart booklet. And in the event that your last visit to the optometrist put you officially at three lenses away from being a fly, you can always print these charts out at a slightly larger size (depending on your printer's capabilities), making them easier to see. And no, there's no law prohibiting you from making the charts larger if you like (but I wouldn't recommend making them the size of a carpet, since that won't fly).
If you haven't taken a look at the government's National Aeronautical Charting Office (NACO) charts lately, do so. These charts now employ a new charting format, making them as useful and as easy to interpret as other approach charts on the market. Try them. I think you'll like them.