Theyre kind of trash, I rocked one for a while in my gear bag, used it a handful of times, mostly as a simple volt probe or "the signal is moving".

And my irl job is chip/board bringup so I'm the best use case.

The portable hantek ones though, I swear by them, they do everything and you can plug them in to usb and run them on Linux.

The credit card ones have shit probes and are just barely worth it, especially since I mostly work at higher frequencies, I wouldn't trust it past audio and I wouldn't trust the precision much around that.