Could you please elaborate more on the "narrow sweet spot".?
I would love to know which applications fit this sweet spot.
1) Extremely simple or very flattened data-model 2) Few writes, TONs of reads (I peak at 150 requests/second every day) 3) The occasional DeadlineExceededError causes me little or no headache. For some people this would be frustrating.
Also AE is awesome as a CDN. The latency is very tolerable for static assets.