Birth Control IUD

Lia.
Anyone out there using the IUD? If so, how is it working for you? Did you get any terrible side effects from it? Or bad experiences? 
I'm nervous about using any type of birth control due to my bodies sensitivity and some of the severe side effects you can endure. I've researched a lot... And I'm really thinking of using this one. Just want to hear some takes on it from any users out there. 
Thanks lovely ladies! :)