I am also one that love my vest. I use it most in the seasons like Spring & Fall. I have a jacket where the sleeves zip off to form a vest and I use it more as a vest than the jacket mostly with arm warmers and SS jersey. Usually when I begin my ride it is chilly and as it warms up it is so much easier to pull down or take off the arm warmers than zip off the sleeves of the jacket and arm warmers are less bulky in the pocket. I usually don't have the need to take off the vest as I just unzip it 3/4 way down if I am getting too warm.
I consider it a must have piece of cycling apparel.
2012 Specialized Amira S-Works
2012 Vita Elite
2011 Specialized Dolce Elite (raffle prize) - Riva Road 155
Ralaigh Tara Mtn Bike