We bought this virtual appliance to load balancer our exchange environment and web application. For its purpose, it is working fine, evens out the load and barely uses any resources. Our biggest gripe with the appliance and software is that there is no feature request system in place. You need to take word that the tech is going to actually try and forward the request to the proper team to have it looked at. Also, the email capabilities of the software are primitive to say the best. No way to halt alerts or silence them during maintenance hours. No way to add addition addresses to the sent line, so it needs its own distribution group. Bunch of little things that overall would improve the appliance. Functionality wise, the appliance does as advertised, doesn't skip a beat and barely uses any resources. Very happy with the product, just need to fine tune the management pieces of it.