If she's going to use it every day, then you'd be wanting one that's nice and quick to use. GHD do have a good reputation.

That said, I can't fault Vidal Sassoon either. And as someone said, many hairdressers use Babyliss too.

And depending on when people have tried other brands - I used to sell straighteners at work, and they are always getting better and better. They used to take ages to heat up, and now most are ready to go in a minute.