What do you like best?
I have been using 1password for about 8 years now. In that time I have felt like I actually have a handle on my personal security. The application makes it very easy to make sure all your online identities are safe and secure, and that is my primary goal in using the application.
The recent online sync services that have been created have been great.
The security architecture is also very open, and AgileBits have published a number of white papers outlining how their system works. This is exactly what I need to see in a password manager to ensure they have not cut corners or have left themselves open for attack.
What do you dislike?
Some people have complained that it is expensive, and I did when I first bought it, but looking back at how many years of excellent service I have had I have no reservations about spending the money that I did.
Also, there is excellent built in OTP/2 factor password support which works very very well, but is pretty hard to discover if you have never used it before. It would be nice if they could make it easier to find for new users, or perhaps suggest people use it if they detect a service supports OTPs?
Recommendations to others considering the product
Give it a shot, try out some of the advanced features. Also take into account the history of security incidents when considering password managers.
What business problems are you solving with the product? What benefits have you realized?
We use the "teams" product at work, to easily share authentication information with all staff members in a secure way. We can audit and revoke access very easily and the web-based administration interface for this is incredibly fast and pleasurable to use.