I have the older one DGL-4300. I don't know how well it works though, in theory it should work as QoS does a similar thing.
I guess when I got it my pings were a bit lower when I had BitTorrent running during gaming. Of course, if your Internet has no load on it, GameFuel isn't going to magically lower your ping. It only works if you have load on your Internet, and substantial load, not just some web browsing.
It does support a ton of connections at once though. My DI-624 reset so much with any large amount of connections. So I guess that's one plus.
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