I was testing out the default books, and find the user interface horrible. The text does not go with the size of the device, there are no options to change fonts or text size, and just when I try to give more test on a local epub file, a video Ad wall pops up, like 5 seconds after I open this app! I can't believe how eager this app is that it won't even leave me alone until I run a complete test! No respect for user experience at all!