Black Rock is my favorite coffee shop in the Chandler area. Coffee selection/variety is solid, and everything you get here is really good.
I personally like their "Blackout" coffee (hazelnut mocha) the most. It's on the sweeter side, but I prefer my coffee sweeter rather than more bitter--so its perfect for me.
I also come here to study and do homework. Environment may not be for everyone because the music is a little more upbeat, but that's perfect for me and the style of music I love! They've got a good amount of outlets for laptops/tablets and a large amount of seating. Perfect environment for me, which is why I come here whenever I'm studying and in the area.