I just made this cocktail for my husband and I, and we love it. We think the serving sizes are appropriate and used sugar rims on a martini glass. You don't need a namebrand brandy, but I used Cointreau and fresh lemons.
I used cognac instead of brandy and even got fancy with a superfine sugar-rimmed martini glass. I really like this drink, and without the sugar rim, I think it would have been too sour for me. I think there is something wrong with the servings info though. I basically used 1/4 the ingredients to make one serving. will definately have again.