Steam generator irons might look quite similar to ordinary steam irons, but they produce a lot more steam, which is at a much higher pressure.
The large quantities of high pressure steam penetrate deep into the material of the garments being ironed and that helps to get any wrinkles out a lot faster. It also produces super crisp ironed garments at the end of the process.
In short, you get better results a lot faster with a steam generator iron.
Have a quick look at the Tefal steam generator iron UK 2014 range below: