cwilhelmi,
I've not tried it either but really am a fan of "the Macallan."
Did you check to see if it was an actual Macallan bottling? Some times, other venders buy Macallan and bottle it under theirs and Macallan's name. This goes on a lot, especially with Macallan and other top names.
Also, I've found that the cask strength is indeed much stronger and higher alky hall as well! Being a wimp that way, I usually need to add about a 1/4 teaspoon of distilled water to take the "bite" out of it, AYE!!!
PS--was in "Lost Wages" this last weekend for a wedding and enjoyed a nice 18 year($33 !@#$%^ shot) Macallan and a cigar with my new brother-in-law. At $66 bucks plus tip, I could've had the entire phuking bottle for just a few dollars more!! Oh well, so it goes...next time I bring my own in my wee little flask!
Let us know how the cask strength is if you decide to try it.