Yay! I enjoyed it. It's not much different really, though there a few instances of leg braking and almost/nearly trackstanding (well, very slow rotation of pedals, without a wobble, at about 00.1 mph or something) but when I did have to stop I had a couple of times when I didn't get the pedal in quite the right position for starting and had to sort of hop about and lift the back end of the bike up but no major problems. 13 urban miles and many sets of lights at just over 18mph average which isn't that far off my normal 'non-fixed' speed, and I was deliberately going especially carefully too, so I'm well chuffed! The route home is mostly a slight uphill though and the final 2 miles is all uphill, with a particularly steep bit right near the house, which may prove a bit knackering. Think I better not go swimming at lunchtime today - I need all my energy for later!