I have the Macallan Cask Strength 10 year old, that comes in a red cardboard box. It is a long time since i last tasted it, so I had to try it today, to be able to give you a good answer.
It is al ovely dram. Heavily sherried, strong in alcohol, and quite a little bomb of a whisky. A lot og vanilla and oak, i thought. And some smokey undertones. Long beatiful aftertaste. I actualy nedded to zip it a few times before the tastebuds got used to it. But after that, it was pure joy. I can't understand why I haven't tried it lately. I certainly will drink more of it in the near future. I have no problems recomending you to try it.
I remember i bought it two years back, because Whiskymag reported it was one of the best whiskies to pair with cuban cigars. It was difficult to find, but I remember thinking it was worth it, sitting with a few of my friends, each with a nice fat cuban in one hand, and a Macallan in the other. That was a lovely night!