Leaks in several rooms over a year told me it was time...
I had new shingles put on and I'm still trying to understand the pattern they used. At first I was sort of upset because I thought they had used dimensional shingles, when I asked for regular, but now I see it's regular shingles, but they cut some in smaller pieces and layed them over the join areas. It looks good, I think, and hopefully will be more waterproof than normal. Seems like alot of work though.
It only took MG Builders two days to do this. A team of 10 stripped the old roof in a day, then 2 guys and a nailgun did the new in another day.