The hormonal IUD produces some temporary side effects (often users will experience severe cramps the day after insertion, or sporadic cramps as their systems adjust to the new hormonal presence), but ultimately can be one of the most convenient and comfortable birth control/period regulating methods!
The amount of pain that different people experience during insertion of any IUD (copper or hormonal) is different for everyone, though, so unfortunately there is no way to generalize “extreme pain” or “barely noticeable” to a larger population. But it might very well be worth the temporary pain.
Source: sexfromscratch