I am taking the plunge after making the decision that I am a one child woman, to have a Mirena IUD put in on Tuesday. I have heard mixed reviews, so I am curious, what is everyone's experience/opinion on the matter?

Specifically I am concerned and/or curious about the pain during and after, impact on sex, period reduction, reliability, complications, and just about anything else you can imagine.

Let me have it!

(As an aside, I can't be the only person who looked at my pharmacist and said "Uh, I don't think that's going to fit" when I was handed a box the length of my arm, am I?)