I might be late to the party and you might all know this already BUT... after 15 years of straightening and 4 sets of GHDs I've ditched them and bought some Cloud Nines.
They are so, so much better than my recently deceased GHDs. They're like a better version of the original GHD from back in the day.
My hair is very thick and extremely unruly. One hair type is boring, so mine likes to present a fusion of curls, straight bits and an overtone of frizz. It took my GHDs a good 20-30 minutes to make sense of it but the Cloud Nines dealt with it in 5 minutes and then it stayed straight all day, even though it was raining.
You're welcome.