I strongly disagree in principle with the previous posters. While I don't know the effectiveness of this particular product, the prioritization of game traffic for QoS is something extremely useful for anyone in general, and in particular for those whose internet connection is used by more than one device. Some high end routers provide a Quality Of Service filtering option allowing the priority setting of different types of packets. My router does this, albeit somewhat poorly. In my experience router-based QoS is put on as an afterthought by the manufacturer (for regular consumer routers anyhow). The built-in list of games and their corresponding protocols and ports is usually short and rarely (if ever) updated. Manual settings are difficult for most people, and even for experts the number of rules you can add can be limited (they are quite limited on the router I use).
Now like I said I can't vouch for this product or company, but it appears to me like this is the only product they sell and I would imagine their firmware updates are quite frequent and likely include all the settings you will need for today's games.
I've been looking for a product like this for a while (I didn't want to buy an enterprise router and I certainly didn't want to configure the damn thing weekly). I might buy this thing myself. Although $200 is a bit steep.