just wanted to put my 2 cents here - I've been playing 9-strings for 5 years now and playing the 11 at NAMM was like going from a 4-string to a 5-string. I have a few pieces that would be considerably smoother with that high string so I'm looking forward to getting my 11's (one from conklin and one being built by a fan)...
As for it being ridiculous? I'm with Brad on this - I don't really care what people think. At shows playing a 9, besides compliments, I get questions like "how big are your hands?" or "how much does that weigh?" but I get no snide remarks (at least not to my face

). If someone wants to play a 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12+ instrument, I say "Go get 'em tiger."
Regarding this particular bass, Adler is a great builder but that 11 is completely opposite of what I'd want in a bass - almost everything - bodystyle, balance, string spacing, woods (not into maple fretboards or koa - sorry guys), finish, price and no fanned frets. Again, Mike makes good stuff - but that bass was so "not me". Of course, I'm sure the same can/will be said for my instruments. hahahaha.