I love Joe Haldeman's THE FOREVER WAR and FOREVER PEACE, and I heart shapeshifters obviously, so I was excited to read this novel (especially after I read an excerpt of it in the James Tiptree Anthology 2). It's a fine book: gripping, a little dirty, explains some science and math things. I got up early on a Saturday morning to finish it. All that said, the writing (language, plot, character development, and pacing) seemed hastily done, and the most interesting aspect to me (the gender shifting and sex bits) was pretty heteronormative even though there was homosexual (maybe even queer) sex. I dunno. I liked it, didn't love it.Warning: there's a nasty graphic rape scene early on, but it's meant to be nasty and isn't gratuitous.