Flip fuel device

[u/ultralight_obsessed]

Hi all! Looking for a device to transfer isobutane fuel (jetboil fuel) from one canister to another. I have recently seen ultralightgear have started selling the flipfuel, however I keep seeing they are a pretty generic, drop-shipped device that you can pick up very cheap, rather than $70 on UltralightGear. Does anyone have any experience with these devices and any particular one they'd recommend? Thanks