all st8ening irons should be burned.

I use my Sedu daily for touch ups.  No problems with damage that I can tell.  I don't think I could manage without it.

Sorry can't agree with you there. I've been using mine for a year and my hair has never been better. Yes constant heat will cause some damage but if you use the right regimen, the right products, and most important the right iron, you shouldn't have a problem. I use a Sedu iron. It is expensive but worth the money. I don't have any swollen spots, and my hair isn't dry at all. But I invest in the best products and do regular protein treatments. I do take heat breaks, even thought I only flat iron twice a week. I will go at least a week without using heat, just to give my hair a rest. But It doesn't feel any better and nowhere near as soft as when I do my regular regimen. So I guess it depends on your type of hair, and definitly the quality of products you use.