It's been a little more than two weeks since my first BIG PROMO on KDP Select. I'm about to start another one next Wednesday. Good thing, too, because my sales have dropped off precipitously. In fact, it'd be safe to say that my sales rank and numbers are right back where I started before doing any of this. So what does all this mean? a) I've still given away a lot of books. More than 6K, in fact. Some of those people haven't read the book yet (or are still reading it), and that may translate into more sales down the road. B) A lot of people only read free. I have to consider this as advertising to pick up the few among the masses who'll actually pay for a book. My units "borrowed" is rather negligible (8 books total), though I will get a buck or two for each one. c) I suspect, to pull this off, you have to have several books available to market. I don't recommend waiting as long as we have to do a second pass. If I'd have had sufficient reviews in by this past week, I'd be into my second pass already. As it is, we had to delay a week. Two weeks is probably sufficient. If you have several books available, schedule a pass every two weeks. Even better if you don't make them sequential books (if they're in a series). In other words, don't offer series book 1, 2 weeks later series book 2, then series book 3, etc. You'll just train your readers into waiting for the next freebie. d) Bottom line: I've still sold more books this month, and made more money, than I would have without doing the KDP thing. But Rome wasn't built in a day, and neither will my writing career. I'll keep you guys posted as I learn more.