Just finished, and Concrete Underground was every bit as good as I expected it.
I loved its dreamy, cyclical nature. I loved the little inconsequential(or not) details, like the art installations, or the description of the faults of mystery fiction, or the pieces of wisdom spoken by unexpected characters in unexpected moments. I loved its definite Lynch-esque feel. I loved its punk-as-f*ck language.
I will definitely re-read, to catch details I didn't on the first reading, and to enjoy again scenes that stuck with me.
I've now read everything you have online, Moxie, and I have to say you are in my very short list of writers whose books I eagerly await, and will drop everything else to read.