The AVS is incredible. I love this thing so much and it's allowed me to finally do something I've wanted to do my entire life.
Load a saved Excitebike track using my childhood cartridge.
As a kid, I'd sit there after having worked on a track for I don't even know how long, and nothing would load. As an adult I discovered that it had to do with a tape player interface that never made it to the US. Now, 20 years later, I've finally loaded an Excitebike track using the very same cartridge that caused me frustration before. It's cathartic to say the least.
It's also fascinating from a technical standpoint. There was no doubt that American cartridges could work with a tape player, but I don't think I've ever seen an example of it online anywhere so I uploaded a video of it to show that yes, this works.
The AVS is perfect for this kind of thing due to it's inclusion of the Famicom expansion port, which is neccessary to plug in the Family BASIC Keyboard in, which in turn is needed to plug in the Tape Player. It makes the entire thing a relatively viable thing to do as well, if you're willing to deal with some clutter on your entertainment stand and tape loading speeds.