1. We're currently focused on EC2s (it's been the largest line item for our first few customers).

2. Rightsizing and spot fleet management keep our users coming back - but our customers get the most value the first month. Almost all of our customers have renewed their subscriptions after the first month so far.

3. I don't know how well the computer optimizer model performs, but we haven't had a customer take a recommendation and regret it later on. For our enterprise plan, we fine-tune our models to a company's historical usage (rather than throw a standardized model at all of our users).

Happy to share a screencast! Feel free to email me if you'd like.