Chi Ceramic hair styling iron

I have real thick course wavy hair, it used to be curly, but has become just frizzy and dry from all the perms and chemical straightners from all the years. I just recently borrowed a friend`s Chi Ceramic hairstyling iron and silk therapy by BioSilk and used it on my hair. It made my hair sooo soft and straight (I love it). But I was wondering if using this about every two to three days would burn my hair. Anyone out there use this iron before. I would like to buy the iron if it is ok and won`t burn my hair. It does a real good job, my hair is now not puffy and frizzy, I can actually swing my hair around and not have to use my hands to pat down the pouffiness. Any comments would be appreciated, especially since this iron is a professional one and costs a lot of money. :)