Not wanting to dismiss your negative experience, I’d like to add that SIMMAX.it almost exclusively sell equipment for DIY cockpit builders. So their stuff is not ready to use and you would always need an Arduino board to make it work with a PC. That is also clearly stated on their homepage:
“VERY IMPORTANT:
to interface with your computer our hardware products that are not plug & play, you must use an Arduino Mega 2560 board, not supplied by SimMax.it.”
All their products that actually ARE Plug-and-Play - like the TPM - are in a special category on their homepage. The TPM with the Flaps lever actually IS available as Plug and Play:
https://www.simmax.it/prodotto/single-throttle-engine-deluxe-flaps-plug-play/
Also I had one of the plastic parts inside break and I contacted them and they immediately sent me a few replacements free of charge. In general communication with Simone was always very friendly and considerate and he always answered fast and explained the differences between their products. So in my experience calling them scammers is nothing I can even remotely verify.