Rudy - As has been mentioned, Springbanks are all over the map WRT flavour profiles. (Small batch bottlings with no distinct distillery "profile" so the proportion of different cask types, levels of peating, ages, bottling strengths made for a huge number of different distillery releases - plus Springbank being such a desirable malt for the blending trade and with J & A Mitchell trading off casks of Springbanks for other malts for their blends and the Cadenhead's line, there were lots of casks of Springbank which got into the hands of Independant bottlers). Prior to the mothballing in the 1980, Springbank made the best malt. Period. However, after their restart c. 1987, they didn't use their own maltings and outsourced the malt. I believe that they began doing their own malting again in 1991, so future bottlings of the 10, 12, 15 should only improve. But it's going to be such a lonnnnnggggg time until some decent 21 year old gets bottled again!
Small wonder the old 21 is going for 100 pounds a bottle (if you can find it!)
A hot tip for the uninformed: Cadenhead's bottles a vatted malt (Moidart) with a very high percentage of Springbank. Last spring I got a bottle of 30 YO Moidart at Cadenhead's Cannongate shop for 55 quid. If you think the Campbeltown Loch 25 is good - check out some older bottlings of Moidart!