I always thought the concept seemed either a bit uninteresting or sometimes scary.
I dunno, I just prefer the idea of having natural dreams. Most of mine relate in some way to what is on my mind anyway.
For example, if I'm anxious about college or whatnot, I'll have dreams about it.
I've got some work to be done for college when I get back (in 2 days time :3), which I haven't done.
And for most nights this week, I've had a dream that I've been at some form of my college (or older schools), and have either not known where my classes are, or not had my work with me.
Plus, sometimes if I play too much of a video game, my dreams actually revolve around it. Same with reading books.
I had a vaguely Game of Thrones dream some time ago, and when I was playing Mount & Blade: Warband for ages, I had dreams about it...
Which is actually kinda sad when you think about it. :3