'05 293
I just replaced my stock stem on an '05 Large 293 with a 90mm. I cannot believe how much better the bike feels to me. The position of the bottom bracket still seems a little weird, but the pressure on my wrists is gone, and the light front end seems to roll over obstacles better and is both more forgiving and easier to correct. For me, better handling AND more stable.
Some potential qualifiers: I have short legs- 29" pant inseam for 6' 220#. Back problems keep me from dropping the bars much more than 1/2" below seat height (Although I definitely pedal better with them lower.) I'm no guru; I've been riding in short binges since '89, but intensively since last September (3-4 2+ hour rides per week)
Never thought a small change could make such a big difference. One of the reasons I bought the new bar was to go to the smaller standard in order to be able to experiment cheaply with a variety of different housebrand stems. I'm real happy with where I am now, but I do love to learn by experimentation.
I want a "knee-friendly" Thomson stem, but I want to do what I can to only buy one. I hate getting a nice part and being afraid to change it (and/or wonder if I'm convincing myself it's the right thing). Part of my cheapskate nature...