We had a protect die with like 5 years of EoL left, and got the SC5 (wired). It’s fine, but it should be like a third of the price. Beyond nest compatability, it’s a basic fucking detector that appears to use a modified protect shell with shitty components, comparatively. But I didn’t have time to look at other options, so I figured I’d try it.
Their app is outsourced too, connecting to a different company’s aws east server, which I had to whitelist on my DNS. The app is trash, and it’s stupid that you need it for setup - they should have just made it ‘press this, chirp for connected’. The app tries hard to get you into their (or the outsourced company, I’m not sure) ecosystem. It’s fine, but it’s not good.
After installing I looked at alternatives for next time one dies, and for the US/NA market, Home Assistant compatability + interlink + dual smoke and co2 + being zigbee/z-wave/matter just doesn’t exist. Which sucks, the protects are great (ignoring the fact that they seem to die early for me, that’s the fourth unit that failed prematurely in the last decade). So unless someone makes one that checks all the boxes for me, I think I’ll have to buy another from first alert.
Do make sure that you can eventually get back in after testing, though. Sure, it’s safer when even you can’t access it, but… :p