I am very late to this game, but I recently setup Homebridge on my Synology NAS via Docker and I’m very impressed with HomeKit and Siri.
Siri is extremely responsive and I feel like my devices are local and not in ST cloud. She seems to understand most phrases better than Alexa for Home Automation. My only complaint is Siri won’t work with most devices when the phone is locked despite my settings preference in iOS. I can now use Siri to unlock my locks, start my car, etc.
The Apple Home app is very well laid out, user friendly and easy to use. Love how you can swipe to different rooms from left to right. Of course, it’s not going to allow for complex automations but Apple is not targeting us power users.
The biggest challenge I have now in my house now is remembering when to use Alexa vs Siri. It depends on where I am in my house.