aj78 wroteIt blocks the 8 pin header that several (possibly all?) Raspberry Pi DACs need, which rules it out for a lot of runeaudio type use.
"Pi Power comes with a 26 pin stacking header. With it, you can use Pi Power with any Raspberry Pi. B+ owners can use Pi Power as an adapter for 26 pin IDC cables that otherwise won't fit properly on the 40 pin GPIO header.
If you are using a B+ and want the full 40 pins, you can add a 14 pin stacking header next to Pi Power."
So not really an issue (for B+)