What do you like best?
The app has a beautiful interface and it's really simple to use. The search feature makes it easy to incorporate articles from popular sources such as PubMed and IEEExplore in your library without the need to add the associated metadata: it's all there. It has a lot of features that support organisation including folders, star rating, flags, color labels and keywords.
Another advantage is that they offer a free iOS companion with all the metadata in sync and the support team is fast at answering your questions.
What do you dislike?
The major problem are the crashes and freezes that should be taken care of. Many times, the app becomes unresponsive. For example, when you're trying edit multiple (20 or more) articles at the same time, the app can freeze for a few seconds. I also find that it takes too much time to start the application. On some rare occasions, I've seen the app crash for no apparent reason, so be aware of that.
Recommendations to others considering the product
Just try the free trial if you're on the fence. You'll easily see that it's a great software and to me, it's the best citations manager of all. Even though it's not free, it's worth the small asked fee even with its bugs.
What business problems are you solving with the product? What benefits have you realized?
It really makes organising scientific articles a breeze (when it's not freezing, that is). The metadata of the scientific articles is automatically filled and I find it a really time saver, besides being pretty accurate.