That internal storage is one of the most interesting additions to this new product from Tablo, because it overcomes one of the less consumer-friendly parts of getting rid of your cable box. While 64GB isn't a lot of storage, it's enough to start recording live TV shows without having to resort to your PC.
We've covered a number of products recently in this same vein, such as the HDHomeRun Connect and software services like Plex and Emby. Where the Tablo Dual out guns all of these options is allowing you to do everything you want on one box, in one app. If you need more storage to record your shows, just hook a USB hard drive up directly to the Tablo Dual. There's no PC required.