I think the derv almost holds its own, I wasnt going into the bends too fast (saving the brakes and tyres for my MOT that was the following day! Passed.) which means you lose a bit of speed on the exit. Along the straights it pulls well but the extra hp shows.
Would have loved to have seen two dervs out there, maybe next time, Will will.???
Great fun, best £25 I've spent for a long time, (and that was at Brands)