Depends on if you like wearing earplugs or not...hahah
SC drop gears are generally very noisy and not needed for the road.
I used to drive with SC box and drops on the road and track, after an hour had a headache, earplugs are a solution, even with a helmet on. The female of the species generally hate the noise too. On quiet early mornings SC drops can be heard a mile away literally, even over the growl of split 45 webers.
Personally I love the sound of a SC gearbox, the whine is perfect, and puts a shiver up my spine when heard at distance.
Like many things Mini its down to personal choice, opinion and experience. If you can get a ride in one first it helps, if not try youtube