I have those straighteners and they're fab! they have an adjustable heat setting, and go pretty hot, like salon straighteners. Thye heat up really quickly too.
I just got a pair of these straighteners today and I have to agree,they are brilliant!!! I would say they are as good as GHD's but as they can be corded or cordless they are easier to use. One word of advice though...they get so hot that I burnt my finger on my hair after straightening a section and then touching it.lol