You are talking about the Paraguard IUD. I got one of these after the birth of my first child, had it removed to have my second child, and just recently had a new one inserted. I do not respond well on hormones and this is a perfect carefree option! The first time I had this IUD I did notice more cramping during my period and a slightly heavier flow, but both were tolerable. It goes in easily and my doctor made the comment this time that the paraguard iud goes in much smoother than any of the other iuds. I have only had the current iud in for a few weeks, but no complaints!! I highly recommend it!
The paraguard iud is currently used for 12 years, but they keep increasing the amount of time because 3 years ago the same iud was recommended for 8 years of usage. My doctor said that in a couple of more years she suspects that the paraguard IUD will be used with no time guidelines because research shows no decrease in effectiveness and no long term problems. I don't think there is any other birth control option out there that can give you numbers like that!