Many of the reviews on here are written by the late-night donut connoisseurs. My perspective is from going to Greenbush weekend mornings.
I have been to Greenbush a few times, and they are always out of all the best donuts. I am guessing that all the late-night donut connoisseurs clean them out.
Last time we went, my husband and I thought to call ahead to see if our favorites were there before making the trip. The woman on the phone was wonderful and agreed to put aside two chocolate cream filled donuts for my husband and I. When we arrived to pick up our donuts, she told us we should feel free to call ahead any time and they would be happy to set aside our favorites for us. It was a good thing we called ahead because they were out of cream filled donuts by the time we got there and ours were boxed up and ready to go.
The $5 apple fritters are huge....as big as your head. My husband and I split one and there was plenty for each of us. These are the best apple fritters I've ever had.