When it comes to buying a WAN accelerator, the number one thing that you save is bandwidth. This is one data point that you should look for when you are doing your POC. If you are not saving bandwidth then it makes no sense to deploy.

If you are saving on bandwidth then the next thing to compare is the application latency. Previously, an application may have been working fine, but problems may occur, such as a slow UI, because certain things are not being passed or fully processed. So, it is important to make sure that all of the applications are still functioning correctly. Then, finally, look to see that the application performance has improved.

For ROI, it isn't that money is directly returned to you. Rather, it is realized in the savings for using a lower bandwidth, or in not having to upgrade your bandwidth with your provider. As a second point, your application's performance will improve over a period of time.

The product generates a valuable return on investment.