What do you like best?
Keynote lets you create presentations that engage!, and in any format. You get a small number of templates, with stunning images and you can use them as a base and customize them from there. Once you're done you can save multiple versions, then send it out to your audience in any format you need: Pdf, word doc, auto-play slide show, with just one click. Keynote is exactly what Apple was built for - designs that engage your best audience.
What do you dislike?
Having newly converted from a PC to a Mac, I did have trouble getting used to Keynote. But I learned and now see great benefit from using it.
The other challenge is, if who you are sending a Keynote file to doesn't have Keynote, they just can't open it. It doesn't convert on it's own like so many other packages do. The solution is to ask first, then send a word doc, after you've completed the design in Keynote.
Recommendations to others considering the product
If you haven't switched from PCS to Mac, now's the time. The visuals you can create to engage your customers using a Mac and Keynote are what will win you far more business than without. Be patient, it's not an easy switch, but once you get down the learning curve, and see the results, you'll be glad you did.
What business problems are you solving with the product? What benefits have you realized?
We had switched from PC to a company of Macs and MSFT 's Powerpoint wasn't working out at all. We also wanted to capitalize on the design capabilities of Apple.