I know its been about a month since the last post here, but here's my $.02
I think pull-ups are one of the greatest exercises a person can do. Even getting to the point that you can do ONE MORE pull-up takes a lot of work. Increasing the number of pull-ups you can do is a thing of pride! I remember when I first started doing pull-ups I would struggle in the 5-6 range.... a few months of hard work and I was able to complete ten and I was stoked about it. At the end of the last wildland firefighting season I was banging out 14 at a crack!
I always refer to pull-ups as a 'man's exercise'.
Anyway--good luck with the workout program! Keep on it.