Does anyone read ebooks on your blackberry? What is your opinion of this?

My son does and has for several years. He's used my own Sony, owned a Kindle and checked out several other devices but still feels that the Blackberry is all he needs, even for full-length novels. Mind you, JB, he has excellent eyesight and is one of those exceptional chaps who can close his mind to the temptation of bells and whistles when he's reading. Horses for courses, eh? Cheers. Neil