I've also been told that at the same speed as a 250/260 they burn the same amount of fuel, but when you want to go faster you can.
No, not much faster at all, maybe 5-10 knots. Climbed like a rocket though, and some major pitch changes with power changes (but not much more rudder needed) as I recall. I'd support triadic's comments about hot starts - they could be a real bugger. I saw a PPL set fire to one at Guildford once attempting this.
And I had an engine failure in one - I "blew a pot" during the run-up (good time/place I guess...).
All in all, the 260C was a much sweeter aeroplane.