Not driven the Morgan but I did have a year driving an F type Jag with the ZF 8 speeder. Its a very competent gearbox and the changes are fast but you find yourself leaving it in auto because it works so well. The flappy paddles are fine but the difficulty is that the box has too many gears so that at any one time you could probably be in any one of three. You are never sure w=ithout looking which gear you are in and often you need to change by two gears to make much difference.
The old plus4 had 4 gears originally. Why does the new one with a turbo need 8?