User reviews, once mixed, are now much stronger as the product has been updated and tweaked since release. It currently earns a 4. 6 star rating following nearly 6,000 reviews at Amazon. While there are other smart smoke detectors available, none that we spotted have received the positive feedback that we saw for the Nest Protect. For example, the First Alert OneLink Est. $110 looks to directly compete with the Nest, but both expert and user reviews are underwhelming.