I brewed a barleywine, and used S-04 on it. The S-04 didn't take it down as far as I thought it could go, so I made a five gallon "starter" IPA with 099, and used the cake to take that barleywine down some more. It performed admirably, but the IPA was extraordinarily dry (finished at 1.002 IIRC) and the yeast imparted a "farty" sort of flavor/aroma to the IPA. The quality was present in the barleywine as well, but MUCH more subdued and inoffensive. It has also been dissipating over time - my last sample was at the 1yr mark, and the "farty" character is basically gone.
For my $.02, I wouldn't use it on anything that isn't very high gravity and in need of this mega-yeast.. For me, letting it age out was very important. Wouldn't use it again otherwise. I do intend to use it on my next barleywine, but will not be making a five gallon starter for it, as I won't want to drink it!
"God forbid we should ever be twenty years without such a rebellion.... And what country can preserve its liberties, if its rulers are not warned from time to time, that this people preserve the spirit of resistance? Let them take arms.... The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants." - Thomas Jefferson, in letter to William S. Smith, 1787