Don't use it if you require low latency - performance is abysmal and the bottleneck is Lambda overhead that you cannot influence. Also, if you don't have a high traffic function, cold start is also an issue, at least when using Java. There is a "hack" to avoid this issue: create a cloudwatch check that triggers your function every minute or so. This sounds weird but if you consider that this is good practice, this gives you an overview how production-ready Lambda is. Nice thing is that is's pretty cheap though.