I used it a lot at first and it taught me about NFC, IR, etc. I made a few remote controls on it, which is convenient to e.g. turn a fan on at night due to its backlight. I also clone Amiibos for Switch games. And make copies of hotel room keys and RFID tokens for backup purposes although some keys can't be cloned. You can monitor all kinds of wireless signals like garage doors getting fired off around you, which is fun. I know some people use the USB feature to somehow install Windows automatically when they have a bunch of laptops to set up.