Omg! I just gave it a try with a barleywine I brewed in march last year. That's very interesting ...it came out with 1/4 of the original quantity. I have frozen the beer, let it drain itself upside down (still in the freezer) overnight. What I've collect seems nothing less than alcohol, really warm, not much sweetness and overoak aroma ( oak soak barleywine). It have an astringency bitterness to (unpleasent).
It seems to bring all the weakness of the beer comes to day!! I realise that my barleywine had too much attenuation, it suffers from lack of residual sugars, no maltiness. So everything is unbalance now , bitterness, oak flavor....malt is missing BIG TIME!! Somehow! the original product is very interesting. It's well carbonate, fruity and oak is still very present...on the other hand, I have to say that I've always found my BW a bit watery!!:S
I use to be really pround of that one, but now I know I have work to do!! I'm thinking of keeping a sample of evry new batches I will brew in the futur from now on and taste it's concentrate to ajust and get the shot!!
I'll do a second draining from the leftover (water) see how it will comes up warming at room temp, there's still lot of stuff in there!
(sorry for my english and bad formulations!loll)