I did it from both sides (Gunnison to Hotchkiss and Hotchkiss to Gunnison) in the summer of '97 and, unfortunately, I don't remember that many things about it other than it was pretty damn cool.
I don't remember its being hard and in fact, I remember that it was a lot easier and shorter than I thought it would be, but that's not saying much. I had done Monarch Pass the day before after riding up from Evergreen the previous day and I remember thinking that Monarch was incredibly hard - much harder than I had expected, so maybe I was expecting the worst with BCOTGNM.
The only objective information that I have is that I know that I had a 12-21 8 speed cassette and a 52x42 crank. It didn't have any very steep pitches and was pretty nice all the way around.
I also remember watching a hawk of some kind eating a bunny on a rock and thinking that was pretty cool.