What do you like best?
If you're creating an extensive company newsletter, an ebook for your product, a newspaper for your school, etc, this is likely the software that you need. It is a high-end desktop publishing product and was the standard back when I was working in newspapers. From what I've heard, it still is.
What do you dislike?
If you're working on smaller projects, you can spend a ton of time just getting things set up and ready for content. For smaller projects, unless you use InDesign a lot, I would recommend other desktop publishing software.
Recommendations to others considering the product
Take some time to learn how to use the product, how to create your custom items that you can add to your library, etc well before you need to create your finished item. It's a very powerful product, but can also take some time to learn.
What business problems are you solving with the product? What benefits have you realized?
I used this quite heavily back when I worked in newspapers - it was the software we used to create all of our newspaper layouts, insert content, etc and then send it to the publisher to be printed. If you're going to be working with a professional printer, this is a very good product to invest in, as it's made for exactly that. It will add all of the crop marks and other tools necessary for your products to be properly printed, cut, and finished. I also used this software a lot in college to create professional looking reports and other documents.