I find PhotoReading electronic text just as easy as physical text. Activation of electronic text is a bit more difficult since you cannot just thumb the book to open to the exact page you need. It also lacks the cognitive cues, right page, left page, x deep or high between the thumb and fingers holding the book. The slight smudges, tears, creases and folds that all become part of the greater conscious cues to help you activate.
Since those things affect traditional reading more, PhotoReading greatly improves reading on electronic devices. The lack of the cues mentioned above have been shown to make understanding text more difficult for the traditional reader.
PhotoReading is reading with a purpose, so flip those pages and activate.
Alex