As it does every so often, Amazon recently updated and revamped its line of Fire tablets to include upgraded models and a somewhat simplified naming scheme. The new models abandon the "Kindle" branding and are now simply known as Fire HDX 8.9, Fire HD 7, and Fire HD 6. To flesh out the lineup, Amazon still sells a Fire HDX and a Fire HD Kids Edition, which is really a Fire HD 7 or 6 with a protective case, accidental damage protection, and a collection of pre-loaded apps targeted at a younger audience.

The model we're looking at here is the Fire HD 7 starting at $139. Technically it's a new addition to Amazon's tablet family, though that's by name only -- it replaces the 2013 Kindle Fire HD and is a fourth generation product...