I have installed it in my 2007 Opel for about 5 months. It works very well, I have no complaints, Gemini is a flagship in alarms. I also bought a shock sensor for 15 euros and added it to the circuit so that it triggers with some violent/sudden contact.
Attention: It must be installed by an experienced and knowledgeable electrician, it is not an easy alarm because it is also CanBus (on the existing wiring, in the same remote control) and requires a code to be installed, where my technician called the company to tell him.

UPDATE 2.5 YEARS LATER!: The alarm works perfectly without any problems! Fortunately or unfortunately, it did not need to be triggered for theft, only for small things like "the sunshade came loose and triggered the motion sensors" or "I forgot the window slightly open and it blew and triggered the alarm"!