I've used this product for years so far in our infrastructure with great success! It's been very helpful especially when working with multiple platforms (virtual or physical). We have used both versions of enterprise va r20 which is why it was difficult choosing just one version over another as they are essentially identical. Both versions work flawlessly together while providing redundancy between them and being able to seamlessly switch from platform to platform without any issues. Having two copies helps reduce downtime by allowing us to quickly restart failed servers/applications should something go wrong.