Andrew, have to agree.
Having driven Mercedes EPS trucks, (no, I know they're more like pre-selector boxes) I love to try a 5 speed sequential, manual, in RTA or 6 speed in Piggy...
Justifying the cost of changing the 4 speed Cortina box in a 34 year old Mog is somewhat more difficult (and would put me into modified if I ever decided to compete

...)
Cheers,