> checking of things

like what?

Door handles

Biggest value I got from my Flipper was when a security company was installing a security alarm in my business local, and made a claim that their tags were "unhackable" and "unclonable".

~20 seconds and one cloning later, the installer said something like "Wow, guess we need to update the employee handbook" and I no longer felt comfortable with the installation so asked them to leave after that.

I also once forgot the garage opener to the public garage I usually use, but had the signal saved on my Flipper, so that saved me like 5 minutes of not having to park, go home, go to the car and then park inside the garage.

Otherwise, it's mostly just for fun.

Out of curiosity - does flipper handle cloning of IC/ID 125khz/13.56Mhz fobs and is smart enough to trick the receiver into accepting it?

Reading and cloning of those fobs was easy, but the receiver wasn't accepting reusable fobs. I had to buy a special write-once fob from Lab401.