I found it to be a nice overview, though I wish she would have touched on Singapore's New Elementary Math series. (No one ever seems to talk about that, it's like Singapore drops off the face of the earth after 6th grade. Is that because they're not as good, or because they're not as friendly to use in a home setting, or ... ? But I digress.) I'll definitely start looking into Art of Problem Solving Introduction to Algebra.
Even though Algebra I is still a way off in my particular family, I'm always on the lookout for what's coming down the pike for my kids. Gotta know what the bridge is supposed to look like when you're done if you're going to build it right.