Which e-reader do you recommend to access OPL books? I would also like it to have a WIFI feature.
This is really a matter of personal preference. First, you need to decide if you want a device dedicated to "just" books. These are e-ink readers, and while they come with few bells and whistles, they possess the ability to resize the text and they give the eyes much the same feeling that they would receive as if they were reading a print book. They have a long battery life and are relatively inexpensive. Amazon makes the e-ink Kindle, the Kobo has some market share, Sony offers solid models, and the e-ink Nook is sold by Barnes and Noble. However, tablets do much more, so many people are using them to also read eBooks. Reading on a tablet at length is harder on the eyes and tablets have a shorter battery life. However, they are basically mini-computers with apps that can serve both productivity and entertainment purposes. Apple and Samsung may currently be the biggest names in tablets, but there are many other choices, and it pays to decide what you really want and to do your research. In fact, some people read eBooks on their phones, although this means frequent flipping of pages.