I have my suspicions of what the outcome would be.
I have my suspicions of what the outcome would be.
The problem is that to do these properly is quite expensive and being fairly strong, you're probably not going to manage more than two or three of them if you're lucky.
To give you an idea if it's done properly you can actually see the difference. Stirred Martinis take longer to cool and are more watery. Shaken Martinis get little ice particles forming in the drink, making them look a little cloudy.
Mythbusters actually did that and yes they detected a difference: http://en.wikipedia.org/wiki/MythBusters_%282008_season%29#M...
I'll leave it to you to watch the video (I saw a re-run a few months ago) and decide if it is real or not. I couldn't fault it barring wanting a lot more replication and testing with different people.
Having said that, I do like the odd Rob Roy. Some places shake deliberately to get the froth as Manhattans tend to have a signature twist in posher places. I think you're right to ask to stir instead for a classic Manhattan (especially if you're using Canadian Club or Crown Royal).
I have my suspicions of what the outcome would be.