we have them (scotland) i don't have any problems using them (when i have them).
and as said, its a pain in the arse trying to use scottish notes down in england. some places are ok, but a large amount of the time people give you a glaikit look wondering what they are. :|.
As for the exchange thing, when i went to canada last year i went into a bank to exchange some money, counted out the dollars i was due, (At about 1.95>£) then they realised it was scottish notes, and gave me them at a rate of 2.38>£ 😀
worked in my favour there!