I've tried a few.
I have one of their drop in 3.5 connectors in my G36. It helped the trigger a bunch. I tried a 3.3 pro and a 3.5 in a Gen 4 G26. Ended up with a dot connector and a gen 3 trigger bar. I may end up with this setup in my G19 as well.
For me, the Ghost connectors in gen 4 gun give me a trigger that just doesn’t feel the way I want. The 3.3 was just to light. I put it in, dry fired it a few times. Took it out. The 3.5 again, just didn't feel right to me. It might be great for you. You just gotta try them out.
One of the cool things about Glocks is that you can play around with them and get what you want.