I saw the Guinness Surger at a local pizza place last week. I immediately recognized the device based on Jay's description. I figured I had to try the device once at least, just to see what the impact was on the beer.

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I had to wait for a bit to see it in action as they had no chilled Guinness cans. The cans were specially designed and labeled. They didn't contain the normal canned widget. But it needs to be chilled to be in nitrogen-carbon dioxide solution because the first time the bartender tried to use the device the cans weren't cooled properly and it didn't work correctly.

The second time went better. Here's the beginning...
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Then the Surger is activated.
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Last what a glass looks like at the end of the process
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(Note: different glass was used this time)

It was a dramatic presentation when it works. I could see this special equipment being used in hotel and other small bars where there are no or limited number of taps. Also admittedly the Surger is as much marketing ad space as it is unique beer gizmo.

The Surger didn't impact the Guinness' flavor with it being as tasty as any Guinness I can remember.

It's a gimmick to be sure, it will never truly replace a true tap pour, but I liked it. It was a cute show for getting your beer.