Hahahahahahahahahahahhahahaha!

So it sounds like to me electric one would be the more common device used, is this correct or not ?
I was thinking the air operated ones would weigh more because the need for a tank, yes or no?
Are these devices expensive to purchase and easy to install or what? not that i want one just curious,
I will google the rest

Air works better Rog.
Having said that, the latest electric power shifters work pretty well too.
Yes these are expensive (ish) toys really...
And no, they aint a nightmare to fit man!