Instruct: Classify a given review into positive or negative sentiment.
Query: Avoid - 3 months and I'm still waiting for a replacement from First Alert

I purchased this unit from Amazon back in January - I should have returned it to Amazon who whould have given me a refund - instead I called First Alert who told me that the sound I was hearing was an error code and the unit needed to be returned to them for testing and that they would ship me a new unit out but they were out of stock but I would get it within two weeks. It will be June in two days....I suspect they must have issues with this unit as it is out of stock everywhere and judging from the reviews they've had a lot of problems with it.