My friend and I had been setting up one of our sites using the App Engine (we have our own domain and front-end but the front-end communicates with the App Engine back-end via Json). Our experiences in the past months were very mixed. It’s a nice framework to develop in, if you don’t mind getting your head around the pros and cons of accessing data with the scalable datastore approach I guess, but the outages were quite heavy. For several weeks, the scheduled maintenance downtime alerts (as well as the alerts related to non-scheduled problems) kept piling up, so this wouldn’t have been a realistic option for a hugely important site. Even for our smaller fun project, it caused headaches... imagine you’re being linked from a newsletter or a popular website or so and then there’s a one-hour downtime. On the other hand, the App Engine is of course also completely free for starters, until you want to buy into additional quota.
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