Alright, as a new DTW FO who is still on reserve, I will respond to those of you suggesting we are overworked. I have sat a few nights without being used and have only flown 18 hours all month. I have called to get open time and been denied because they "need" me on reserve. As I understand it, we had three ready reserve fo's at the airport last night and not one got a call. With even more people coming out of training soon, it could get worse for those of us who may want to fly more than the monthly minimum.
That being said, I could be in a minority here. Maybe I am sitting on days that are running smoothly. I have heard of people getting used a lot, just haven't seen it first hand.