Crab-like Spiny Orbweaver

We have at least two of these spiders in our backyard.  They make a small web that is attached to it's surroundings with loooong strings.  It's very interesting.
Here is the picture I took this afternoon of it's belly.  I couldn't get the back, but it is white.

Kind of creepy, I think.

I looked it up on the internet.  I think it's a Crab-like Spiny Orbweaver.  It said in one of the articles that their webs can be a nuisance (which is so true!) because they put them up in the most inconvenient places and you walk through them.  I was happy to find out they are harmless.  Does anyone know if this is a correct identification?