I have one, loaded it with Xtreme firmware (better than unleashed etc.), and works great! some people are missing the point of this device and start comparing it to an advanced NFC tool or other SDR, that’s not its intended use, it is AIO swiss army tool style that you will (might) find it handy in situations that other advanced tools aren’t around, for example I have some advanced SDR like BladeRF and limeSDR, far better in terms of everything than the flipper, but in many situations it would be impossible to use one of these SDR, not just how suspicious it will look with all that gears, but simply you just don’t have it at that time. So I have my flipper loaded with all fobs keys, garage (yes it does work with rotating key if you pair it), all my home sub-ghz, IR, are all backed up as well, and as someone who works in robotics I find the quick access to GPIO is handy sometimes, among other usages, for example, I have a friend who lives inside a uni dorm, and if you happen to lock your keycard inside your apartment, the cost to just open that door is $50, not even replacing the card.. so after he paid it few times I took a backup of his card, and whenever he locks it, he will call me and I open it for him.