See I think they're good- definitely the best I've used. My hair is straighter and silkier when I use them and they are slightly quicker but it still takes me a good 20 mins with them. 20 minutes I don't really have every other morning! My hair is quite long though- down to the bottom of my shoulder blades, and theres alot of it.
If you're going to buy straighteners though these are definitely the way to go. They have them on Trademe too.
Trademe