It came with the exact recommendation AWS gives, to replace one instance with a reserved instance & save about 240$ anually. And that instance happens to be a temporary one we needed to get rid off anyway.

So for me, it is not much better then the existing tooling offered by AWS when looking just at the savings. That being said, I do spend some time on checking the utilization & coverage of reservations every few months. This tool is so much more usable, gives immediate insight AND a 'buy now' button (approve).

Since it only takes me a few minutes every few months to go through all services we use, it ain't worth it for me. If you have a much larger organization and people spawning instances left and right and a highly variable load over longer periods, it could be nice I guess?

One big ommission in my view is that this tool does not look at RDS/ElastiCache/etc at all. This is where 40% of our running costs come from & 90% of our prepaid reservations are. Most of our EC2 spend is on spot instances, so nothing to be gained there anyway.

And with that, the value of this tool comes down to nearly zero in my case. It would save us about 0.2% if that instance had not been temporary. However, had it not been, we would already have a reservation for it anyway :)