I had one and sold it.
It wasn't because it didn't work, but rather the distance from my smoking building to my home. You are limited to the Bluetooth capability of your smartphone.
Keep in mind it doesn't speak to a computer, or to a remote, just your smartphone when it is in the range of Bluetooth connection. If you stray from the house or yard you lose all connectivity to the device...
It worked well, but not with great distance for my application.