I had this done 2-3 years ago and I loved it! I wouldnt recommend getting it done if your hair is already week or has lots of colour done to it as it could cause it to become brittle and not very nice. The best thing to do is ask the hairdresser if they recommend it.
I, personally, loved it as it meant i didnt have to straighten my everyday! In the long run it will probs be better for your hair then straightening all the time as you only have it done the once! Gave my hair that silky feeling you get when you finish straightening... It lasted until my hair grew out which was about a year or so. Im definately going to get it done again when I go to japan/china next. Its way to pricey to get it done in the UK!
xxx