I'll be in line to shell out my money to support my hobby. I didn't get much use out of the first one, but everyone has promised that this one is better. If not, I guess it will collect dust next to the 3.0 version.
I bought it, and it is vastly superior to the old 3.0 Psionics Handbook. As a rabid fan of psionics, the old book disappointed me, and I hardly used it. The new book is awesome, and will definetly see more use in my games.
Woot! I bought it, and it was a great purchase! This is much better than the original PsiHB. Things like a subtype for psionic creatures, a specific psi-like classification for monsters' psionic abilities, psionic versions of select monsters from the MM (like mind flayers), a wild talent feat...yeah, much better.