Not only is this article is outdated, it makes broad sweeping generalizations that make little sense for usage patterns that differ from the author's. Reserved

Not only is this article is outdated, it makes broad sweeping generalizations that make little sense for usage patterns that differ from the author's. Reserved instances make perfect sense if your server on EC2 is running 24/7 for months on end. In fact, with now that Amazon has different rates for medium/light/heavy utilization, it makes perfect sense for even more situations. We've taken advantage of RI's at my startup and the benefits are pretty clear. Our app servers are micro instances running PHP, Python and Java (SOLR). We scale by adding more instances not by renting bigger servers, so our RI's are always in use. It's also worth noting that the reserved instances for RDS are a great way to reduce costs as well (if you choose to use RDS).