I'm a reasonably open book. I like to think that I'm pretty transparent about what I think, how I feel and what I believe.
If I like something, I'm not hesitant about sharing my love for that thing. If I don't like something, for example, how an individual is behaving, I'll say that as well. (I'll try and find the right time and approach, of course, but I generally prefer not to leave things unsaid. Particularly if they are someone I need to have some sort of relationship with.)