My five... soon to be six... books are just a small part of the Smashwords numbers, but all the attention drawn to Smashwords has helped me. Thanks to Smashwords, my YA Book A Family Legacy: THE WATSON WORKS hit the top 1% sales rank at BarnesandNoble.com, but my other titles have also done extremely well. There have been many thousands of downloads and sales of my books, and the numbers continue to increase. Look for my newest book, AIDEN'S ARRIVAL, on Smashwords, late in December.
All in all, I'm very happy with my own success, and very pleased for Smashwords!