Pops doesn't post much, but MAN, when he does..
I am currently learning the rolled in, 50/50 (Actually, my instructor wants placement more above the lips, but I find the 50/50 works A LOT better) playing. My low range is godawful (I can pedal, but the low Ab-Gb hardly ever works...), and my limit range-wise is a Eb past tune C, but I already notice an improvement in sound (When I used the corner embochure, my sound was kind of whiny, and really didn't make a great, fat sound), and I don't shoot chops near as fast (Although after an hour and a half of buzzing/playing, I start swelling...).
Its aggravating, going from being a half-way decent college-level player to being basically on the same level as a new player again. Its also going to take a hell of a lot of work building muscle in the part of the lips I am using now, but its not like I have nothing better to do, right?