Caldwell certainly has a distinct writing style. These are more prose poems than true prose, and she heavily favors writing these to a person (using a lot of "yous" in her writing).
I discovered Caldwell when Powell's sent me a piece of her writing as part of an Indiespensables package (if you're reading this, chances are you like to read, and I would highly encourage you to look into Indiespensables). I'm glad I bought her book--the style is right up my alley. I did find, though, that because she had SUCH a distinct style, it got a little tedious. The good news is that these are short stories/essays, and you can stop and start as you please without losing much.
Caldwell writes about things I can relate to (love, mothers, moving across the country, crazy camps that make girls cry in a relieving, freeing sort of way) and lots of things I can't (drugs, orgies, an intense need to snoop through the belongings of those she loves). But she tells it all in such an honest way.
This isn't for everyone. The subjects can get very crass, and the language isn't clean. If this doesn't bother you, I would highly recommend you give Caldwell's little book a shot.