What do you like best?
I really appreciated the ease of use, and especially the ability to use keystrokes to accomplish tasks. For me, this is really important, but I can see that this isn't always a plus for everyone.
What do you dislike?
The graphic interface could use a rework, but for the type of software, this isn't too big of an issue.
Recommendations to others considering the product
Learn your keystrokes and learn them quick. It will make the effectiveness of the software so much better! Compare this software to SirsiDynix's other software options. This will be very helpful, especially looking at multiple options from the same company. Their Symphony program has the same end goal, but uses a very different method for attaining that goal (more graphical interface heavy than Horizon, for example).
What business problems are you solving with the product? What benefits have you realized?
Cataloging (encoding metadata) and processing of backlogs. For others within my library group, this software was used for other library solutions: checking in and out books, managing billing services, and especially as the back end database management of the library catalog.