yeh, they don't work very well. i took mine to america a couple of years ago because i had to go to a wedding (and therefore needed straight hair), but it took me about two hours to straighten it all properly (although i did have very long hair at the time, and there is quite a lot of it). do you really need to straighten it? the humidity will make it curl, so you'll need to do lots of straightening to keep it under control, which means you will damage it. maybe just get some smoothing shampoo (pantene pro-v stuff actually does work - i've got really fine curly hair and it works on me!) and perhaps some curl controlling stuff. it's actually really refreshing not having to iron your hair!