A Chi is too rich for my blood. If I were going to straighten more than once a month I'd probably spring for one. But for my needs, just to straighten once or twice a month, it isn't worth it.
I have a Remington Wet 2 Straight and it works a treat, and my hair doesn't get burnt or fried or whatever.
Like I said, if this were a daily thing with me I'd spend more money on an iron.