At first glance, the guinness pours much more subtly (understandable given it was sitting uncovered for 10 min)
When swirled, it gives off some very nice cherry aromas, some cabernet or shiraz spicyness is in there too.
The oak is Definitely pleasant & very noticeable. At first, the beer seems much smoother, it lost some of it's roasty sharpness, there's kind of a milk chocolatey quality about it. There are some charcoaly notes to it, some vanilla, some woodsy flavoring too. There's a nice toasted wood character on the finish that lasts.
Compared to the control cup, it's a totally different beer. Almost like a casked smoother Guinness.
I would definitely recommend this experiment to anyone interested