I've got a 140 mm and I don't have any more problem with it than I did my 120 mm. When I raised the height of my stem, I had to go longer to match the amount of stretch that made me comfortable. And yes, I said I raised my stem. I know that violates the flip it and slam it rules, but screw them, I'm a lot more comfortable. I do need to get a new cable for my front brake though as now it's only just barely long enough and I'd like a tad more length for adjustment.
__________________
Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"