Recommendations to others considering Keynote:
Go for it. Simply brilliant of a tool to make presentations. It might take a day or two to get used to it, but once you start, it's impossible to go back. Review collected by and hosted on G2.com.
What problems is Keynote solving and how is that benefiting you?
Presentation making! That's one thing Keynote made extremely simple for me. Compared to its obvious competitor - MS PowerPoint, Keynote has limits in terms of what you can do. However, those limits end up working in your favour because you're not boggled by a plethora of options in front of you. There are things you can do, and there are things you cannot do. However, the things you cannot do in Keynote ARE NOT NECESSARY to create a nice, beautiful presentation.
Further, there are add-ons that you can download and install in Keynote. Review collected by and hosted on G2.com.