To answer your question, yes, I have read Heart-Shaped Box. I have also read Horns and 20th Century Ghosts. I'm eagerly awaiting his next, NOS4A2. I've also read about a quarter of his graphic novel series, Locke & Key. While he does write in the same broad genre as his dad, Joe's writing style is quite different.
I prefer Horns to Heart Shaped Box. Thought it more believeable and real. His style is less wordy a little more raw. Locke and Key is amazing. Really, what do you expect? Both of his parents are brilliant and he has raw talent.