Yo, Bret... tried that Glenlivet Nadurra Oloroso last night. Initial impression is that it's OK. Didn't blow me away. Very heavy sherry influence, didn't seem like the underlying whiskey had much of a backbone. Only had the one pour of it, though, and didn't add any water, so maybe that will change it a bit. The cigar also overpowered it.
I'll have to give a second impression of it after trying it without a cigar.