2011-04-03 Sun - Cambridge ride. Fixed-wheel bicycle required

not really. I couldn't off curbs in the same way (it was like one wheel at a time as opposed to one jump and one landing) and when I was walking with my bike or picking it up, I had to remember the weight was different and treat it accordingly. But when actually riding I can't say that I noticed it. I don't think I'd use it in the city when weaving although I think it would be fine, I'd just rather not. I think overall it was pure perfection, especially for country side journeys.
Main thing is that it can hold a LOT. And probably if what you're carrying is super heavy will affect it more but with what I carried (above) was fine.

awesome, sounds like exactly what i'm after. need something for the longer rides this summer, i'm fed up of having my messenger bag!