After this latest round of price cuts, I'm starting to question whether I even want to reserve instances on the lower end. An m3.medium is about $52/month on demand vs $35/month (amortized over 12 months with a 1-year heavy usage reservation).
In this example, it becomes a question of whether it's worth saving $130'ish a year for the liability that a 1-year m3.medium heavy util reservation represents. At the lower end, that's not a huge amount of liability, but it may be a case where I just don't bother reserving m3.mediums anymore because it's a wash.
Maybe my math is off, but I calculated $35/mo for medium utilization m3.medium vs $32/mo for heavy utilization. In that case, I don't think a heavy utilization reservation makes sense but a medium utilization reservation still might (as you're saving ~$20/mo over on-demand).
In this example, it becomes a question of whether it's worth saving $130'ish a year for the liability that a 1-year m3.medium heavy util reservation represents. At the lower end, that's not a huge amount of liability, but it may be a case where I just don't bother reserving m3.mediums anymore because it's a wash.