my best friend and i had it put in at the same time, 3 years ago. i hated the bloody thing, i had it put in( which is fine, local anaesthetic then it goes in a syringe and pops in your arm) then bled for NINE WEEKS! I wanted it out after 6 but they put me on the pill to control the bleeding (IMO, if i have to be on the pill i might as well just be on the pill lol) after nine weeks i put my foot down, after putting on 2 stone i'd had enough.
my best friend had about four periods the entire time she had it in, and she's only just taken it out as she wants a bubba. she loved it and will have it again after she has a baby. i think it depends on your body, i liked not having to remember my pill - i'm not very good at remembering it, hence lucas hehe but it does reallt suit some people