First of all, it's still in beta, and, as you already know, doesn't yet support InDesign CC (nine months after its release).
Not everyone is thrilled with it as you can see in the thread below:
If you're serious about creating eBooks, you should watch Anne-Marie Concepcion's new video on creating EPUB from InDesign CC on Lynda.com. She goes into the plusses and minuses of the Kindle plug-in versus an EPUB to KindleGen approach. (If you don't know what that means, you need to study some more, I'm afraid.)
thanks, Steve. I have looked at that video and found the whole thing daunting. Especially since I've got a deadline on this book. I've decided to send Amazon a PDF and pay for their custom epub formatting. They seem to have excellent support, and the price isn't too high. Whewww!