As a self-published author, I'm always looking for ways to market my work. There are a lot of options and I've tried many: blog hops, giveaways, ads. You name it, I've given it a go. The success of such promotions can be measured in a number of ways, but if you want to increase sales most don't give much bang for the buck.
Given my prior experience, I was reluctant to shell out more money on the Lendle Today's Featured Book Promotion. For $35, they promote your Kindle book on their website, Twitter and Facebook and in emails to subscribers for the entire day you book the deal. I decided to throw caution to the wind and check it out. In that 24 period, I sold five times as many books that I had the rest of the month. Now, I don't sell huge amounts, but five times more was a big deal, and I definitely made back the invested money.
The scientist in me wanted to try to determine if this was a fluke. So, a few weeks later, I promoted the same book again. I figured sales might be less than from the first promotion, reasoning that the people who had previously purchased the book obviously wouldn't be buying again and a similar cohort of folks would be seeing the promo. Surprisingly, the number of books sold was slightly higher the second time around.
From my experiences, I recommend the service. I'd be interested to hear from others that have bought the other promotions - which are more expensive but are genre-specific and last a week - for their impressions.