I like that it's completely free for small sites or even just testing out products! It has been very helpful to give us an idea of what we can expect when going live as well as provide some insight into our specific needs/concerns before making any decisions about other services. There really isn't anything at this time that is not great in my opinion - so no complaints here either :) We are currently running tests using wan optimization. For now, there aren't many options available but they do offer multiple packages depending upon your site traffic volumes (both current & future). I have been using this product for several years now in my place of work and as a consumer. The features are so easy to use and the results are usually immediate. It is a great tool that has helped me in many ways. Nothing really, it works well! A positive thing about this product is how user friendly it is. I can’t think of anything bad, either. Just make sure you know how to use it properly! We use WAN optimization at my work, in which we are able to save money by reducing our monthly data transfer.