The primary reason we initially got it was to help us to right-size all of our VMs, to make sure that they were the appropriate size for the amount that they were being used. That was the biggest push to get this, and we implemented it.
We have also discovered that Turbonomic can automatically suspend virtual machines that were on a schedule. For example, in the afternoons and the evenings when a VM wasn't going to be used, it could just be shut down, so that we wouldn't be charged eight to 10 hours of compute time, per machine, that wasn't going to be used at all during that time. That's been pretty useful.
We're also using it to help us determine the reserved instances that we need. We haven't purchased the reserved instances yet but we're using Turbonomic's suggested reserved instance purchasing algorithms to assist us in finding the right balance for the number of RIs that we want to purchase.