My first book, Mattress Buying 101 was recently offered on June 6th and 7th as part of a free promotion. I hope you took the time to read it, or at least download it for future use.
I am an Amazon guy. I use Amazon exclusively to publish and promote my books for the world to read. One reason I do this is because Amazon makes it super easy to get content into reader's hands and build a fan base.
Free is free, and I like free! The kindle app is free! Download it to a variety of devices and take your books anywhere you need to go!