Author misses one important point with Redis: you don't pay for traffic. If you host it yourself, you pay for traffic both way if traffic crosses AZs. Dynamic s

Author misses one important point with Redis: you don't pay for traffic. If you host it yourself, you pay for traffic both way if traffic crosses AZs. Dynamic scaling, no downtime upgrades,æ. It works really well. I do hope they will get tiered RIs for ElasticCache like they have for RDS.