A few things to look for when you're shopping for a hair straightening brush:

-Seamless bristle nibs that are not a separate piece from the bristle shaft. If the nibs are separate, they're likely to fall off, leaving a plastic spike behind that isn't going to feel great on your scalp.
-Always opt for a ceramic coating. Iron and plastic are more damaging to your hair.
-Try holding the brush in your hand before you buy it. You might be surprised how a little thing like power button placement can be a deal breaker.

How to handle styling:

-With all models, I found that separating my hair into three sections from top to bottom made straightening easiest.
-For best results, do one sweep with the hair straightening brush on the top of the section, followed by one sweep down from underneath -- or vice versa depending if you want a slight flip. -Straightening brushes are not the best for finishing off short bangs or side slants. I still recommend having your narrow flat iron on hands for touch up, especially if you have baby hairs.