The ability to get automated three years Saving Plans coverage without the commitment is huge, especially when you got an unpredictable workload spread between different regions and different instance families. It basically cuts your EC2 spendings by 40% They also offer a 100% refund for unused commitments. There's also a very promising Zesty Disk that can also bring unmatched capabilities. I haven't put it to the test yet, though.

I was easily able to convert the IAM permissions into terraform policies for controlled deploys, rather than using cloudformation. Achieving what we set out to, by not having to manage savings plans to get maximum utlilisation.

Zesty is a completely automated platform for managing RI's and the team is extremely proactive and helpful in onboarding and helping us track to achieve cost optimization.