I was a bit reluctant to publish my books on Google Play because I'd heard it was complicated and that they tend to discount unexpectedly, which can create havoc on Amazon if they price match when you don't want them to. However, I found a great checklist that guides you through the process. It's not that hard, but to me, it's strange how much Google uses ISBNs to identify books. You start the process by entering an ISBN, and you have to use the ISBN as part of the file name(s).
Lyon's Legacy is live on Google Play, and Twinned Universes went live this morning. Unfortunately, I do have to price my books higher on Google to get around the random discounting. Lyon's Legacy is $0.99 on Google (I don't think they discount this price), and Twinned Universes is $3.49 but discounted to $2.65. EDIT: After raising the Google price to $3.99, they discounted TU to $3.03. That seems reasonably close to Amazon's price of $2.99, and I will say Google was very fast about updating the price.
As for my other books, Seasons' Beginnings will be coming out of Select next week, and I plan to distribute it via Draft 2 Digital and Google Play. The sequel, Scattered Seasons, will also get wide distribution. I might even put my poetry book on Google Play because, hey, why not?
Do you buy books on your phone? If you do, do you use an e-reader app or buy from Google Play?