Hiya,
I had mine done about 3 yrs ago via a private dentist.
I had clear brackets fixed to my teeth and a regular metal wire. It was only on my bottom teeth but was very discreet and i would have it on my top if need be. I had it on for just over a year.
My 4 front bottom teeth were all overlapping so the dentist removed the front two and used the brace to bring the rest of my teeth forward thus creating room for my wisdom teeth to come through and not be compacted. They have since come through with no pain at all and no problems.
They removed the brace after about 14months and fitted one on the back of my teeth. It is a wire glued on. The globs of glue are not visable because they are on the back of my teeth as is the wire.
The removal of the teeth was painless - numbed the gums with local A. this takes 6 weeks to heal before the brace went on.
I had the brace tightened at regular intervals usually about 6 weekly. This was uncomforatble for a day or two afterwards but not painful.
When it first goes on, the brackets can rub the inside of your mouth but they give you wax for this. You break a bit off the strip, roll a ball and push it onto the bracket. They stay pretty well but sometimes you eat them!
The brace didn't affect my speech but sometimes i would lisp slighty from having the gap in my teeth but you quicky overcome it and it is worse for you, others nver noticed or were to policte to say! The teeth moved together soon enough.
Sometimes the wire snapped (i.e eating toffee apples!) but they just replace it, no great deal.
It was the best thing i did, especially from an oral hygiene point of view.