I might be a bit biased, but even for a local the new guide is very good. It divides the valley into 3 zones and has a map for each zone indicating where the individual sites are. The directions are easy to follow and it indicates the time(s) of year that are good and some of the birds you might expect to find. For 5$, I think it's money well spent. We have had a lot of interest in it.
The only draw back might be the size, which is the standard sheet size of 8x11. It's not something that will fit into your pocket. I personally don't find it a problem.