Sequential gearing is awesome, but a bit of a pig to try and use on the road.
I drove a mates Time Attack Escos from a camp site in to Silverstone a few years back, running 650bhp and full sequential gearing, having driven it on track in anger felt a breeze compared to trying to drive it calmly on the road.
the box wanted you to be firm and precise with it, so trying to doodle along with moderate changes made it a pig to get it to engage gear at times.