Yes, did the 275km version a few years ago. It’s scorched into my memory for good now.
Me and a mate got an afternoon Eurostar to Lille and hung around until 12pm, then rode up to Roubaix to get the 2am bus to the start. At 4am, bus stopped and driver ordered us off, pointing into the gloom saying ‘right, off you now; you can ride 275km back’. Somewhat gingerly we got going but the pace racked up as everyone tried to stay in a good group.
You scud past massive, green wide open fields; the villages are lifeless, grey and silent. The only sound is the occasional church bell. If the sun’s not shining, it’s a hard, damp tough place. And then the pave arrives at 100km. All hell breaks out; it could be like being shot at. I remember people sliding everywhere; lines changing – a kind of stampede. It’s over soon enough and you’re on silky French tarmac again. On, off, on, off for 10 hours.
Really, it’s a great event – an alien world compared to ribbons of singletrack in the south.