Bests & Worsts Reviews from Amazon

I bought this product for its smart home (and HomeKit) capabilities. I wanted to be notified if a smoke or CO event occurred while I was away and to build smart-home automations (e.g. if smoke is detected turn on the lights). Sadly this product did neither for me. I experienced many of the Onelink app setup issues that others on here have reported. With a little patience and two or three attempts I was able to get the smoke detector setup in the Onelink app and showing up as a HomeKit device in the Home app. I then hit the test button in the Onelink app and the smoke detector sounded. The interconnected smoke detectors also sounded a moment later. The test event was logged in the Onelink app. Everything was good...or so it seemed. Pressing the test button on an interconnected smoke detector also sounded this one. I will note that this event was not logged in the Onelink app nor did I receive a notification for it. I saw that another reviewer mentioned this before I purchased it so I wasn’t too surprised when this didn’t work for me either. For a true test I purchased canned smoke for testing smoke detectors on Amazon. I followed the instructions and discharged the canned smoke under the smoke detector. As expected the smoke detector sounded and the remote interconnected smoke detectors also sounded. Unfortunately I never received the push notification for the smoke event from the Onelink app. I saw some reviewers mention that it took a couple minutes to receive so I waited. Eventually the smoke dissipated, the alarm cleared and the smoke detector automatically silenced. Eventually I opened the Onelink app and refreshed the smoke detector. In the recent history the last event showing was the test event from when I installed it. There was no record of the smoke detected event (and still is not days later). Furthermore, Apple Homekit was also never notified which would have trigged my automations and also sent a separate alert to via phone from the Home app. In the end none of the smart features on this smoke detector worked during my simulated smoke test. I ended up contacting support about the push notifications I was told that this is a known issue and the developers were working on a fix. I never received that fix but was contacted to help them troubleshoot a couple days later. After a asking a few questions about my related issues via email I was told that HomeKit alerts are not currently supported. In other words if the alarm was activated it would not notify Apple HomeKit and therefore my automations would never be triggered. This would also prevent me from receiving notifications from the Home app (which should not rely on Onelink’s infrastructure). In the end I am returning this smoke detector since it does not function as advertised. After learning that this device does not have full HomeKit capabilities I did not continue to troubleshooting with Onelink. They did appear to be interested in troubleshooting and fixing their push notifications but the lack of full HomeKit support is a deal breaker for me.