I love these straighteners, I have had mine for years!!!
They work perfectly on my hair, which is awkward at the best of times, but tames my tresses a treat!
The shape of the straighteners doesn't really allow you to create curls, like you can with GHDs, but they do allow you to tuck the hair under (like I used to when I had a bob).
Since using them, my hair is less frizzy, less static and is less likely to kink in damp weather.
They are the best I have ever bought (and I've bought plenty!!) without spending all that money on a pair of GHDs which to be honest, as straighteners aren't much better than FH1, if better at all.