This is my all time pet peeve question, largely because of the responses it gets. If you want to know if it's worth it, it's probably not... to you. Pisa is a whole lot more than a leaning tower. It's a wonderful Italian town. When you get away from the Campo de Mirocoli there is so much that delights a visitor. But the visitor has to open their eyes.

I still remember being able to go into the leaning tower on our first trip in 1971. You really get the feel for the "lean" ! I think all the cables are down now and you can once again do this. Go for it. One of the famous things in the world, plus the church next door also nice.

Have you always dreamed about seeing the canals of Venice, the statue of David in Florence, the leaning tower of Pisa (also the Coliseum in Rome, the Eifel Tower in Paris, the Tower of London?) That's why you'd go to Pisa. But if you don't care and you'd rather see/do other things, skip it for Siena, Sorrento, etc). As Grasshopper says, good idea to really explore all places for what else is to be seen besides the landmarks.
Ozarks Bill

We're going to go and stay in Pisa our last night in Italy. I would have preferred to go to Siena but oh well! Pisa will be fun and it will be interesting to see the Tower. I just want to make sure we see it and then get out off all that touristy stuff. Thanks for the advice!

I was faced with a similar dilemma during our first trip to Italy. Well, we did end up going there and I don't regret it. I think that the site is quite impressive, and like another poster noted - there are so many people on this forum who advise others to not go there (waste of time, unimpressive bla..bla..) - but my 2 cents - it is one of the things that you have to do on your first trip to Italy (just like Eiffel in Paris - no great shakes as far as the view from the top goes - but still most do it; or the Taj Mahal in India etc.).

I think you will regret not going there especially if you don't foresee another Italian trip in the near future.

Definately go, it is terrific fun. Make sure you walk all the way to the top though. There are other things to see and do as well. Or just head back to Lucca.