[pashields]

They handle automatic failover, which redis does not currently do out of the box. That part is pretty cool. Maybe not worth the price, but definitely useful.

[yesbabyyes]

Actually, Redis has a pretty clever failover solution now, in redis-sentinel: http://redis.io/topics/sentinel

[aioprisan]

redis sentinel is out in the latest stable release and was out in the dev branch for the past year