The sad part is that several stores here have taken the Guiness FES off of the shelf to open up a spot for this stuff.
I like the FES, but it doesn't rate the premium they charge for it IMO. I'll save a few dollars and get the regular ol' Extra Stout and have two more bottles to boot.
I have not tried the Black Lager. But I did try whatever it was they rolled out as their anniversary beer a couple years back (100th anniversary?). I did not like it, did not finish it, and they were giving it out free that night.