At issue with many RTD (ready to drink) cocktails is that you lose freshness and gain shelf stability. Fresh fruit and fresh juices and tinctures really brighten a drink. And some RTD cocktails have little tricks up their sleeve to re-create that just mixed feel.
The Glenlivet has an Old Fashioned in a bottle that when you first open it, releases the ingredients into the bottle. Of course, that means the sooner you drink the bottle, the better it will be but it is refreshing to see a classy brand make the effort to give that just made moment.