Ah, I haven't heard of Big Hair... I'll order it when it comes out in paperback.
Bad Guys Won was quite fun, but the writer, Jeff Pearlman, is not very good. He writes with many bad analogies, similies, metaphors, etc. A lot of "Keith Hernandez was a bigger fan of coke than those CG polar bears!" Not good. Not good at all.
Also, he didn't get interviews with Gooden and Strawberry and a couple other key figures. On the bright side, Kevin Mitchell made himself quite available.
All in all, I recommend it if you like baseball and/or The Mets. Also, if you enjoyed Tom & Patton's riffing on Get Metsmerized. There's actually a good five pages devoted to that abortion.