When was it you tried the first bottle of Macallan 25yr? As much as they may try to keep it the same over the years, they can't keep the exact same barley or keep the exact same barrel... So one 25yr will be different from the next. It can't be helped. But the quality should always be high, especially for the price you're being charged. So in that sense there is consistency.
I've always heard great things about the prestigious Macallan brand, but I've tried the majority of their range and it doesn't blow my hair back. Nothing wrong with it, but it noses & tastes politically correct. I think it is trying to be everything to everyone. I've never had the 25yr though, so I am unable to offer any thoughts. And I know people on here love their Macallan's, so I look forward to their comments.
What province are you in with such limitations?