I have a Flipper Zero and I've used it... occasionally. Like that one time controlling the Taylor Swift Eras tour wristbands: https://blog.jgc.org/2024/05/controlling-taylor-swift-eras-t... but it's mostly sat around being an odd device. I duplicated a couple of RFID things, used the IR for some stuff, and once in a while used the radio receiver, but mostly it looks pretty. I'm not sure what I'd do with a Flipper One…
If you are adventurous, many ski stations have low-tech cards as well, although they also tend to have human controllers once in a while.
And, finally, kids like running around with Flipper Zero opening power taps on Teslas.