I just made a batch with beer, but it's still curing so I don't know first hand if it's supposed to be better. It was a salt bar, and I read that the beer will help increase the suds (an issue in salt bars). And yeah, I think part of it is that you can say "this soap has beer in it" which makes it a novel soap to gift to men and beer drinkers.
Remember to boil down the beer. I started with a 12 oz can (that's how much is in a can, right?) and boiled it until it was about 6 oz, which was what I needed for my 2lb mold. If you don't boil out the alcohol bad things can happen. Also, it smells HORRIBLE when you mix in the lye. Bad. Beyond bad. But the smell goes away quickly once you've mixed it with the oils.
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