The "DSLRKIT" splitters that are around on Amazon are reasonable in my experience, although the nominal output voltage varies by upto 10% between units.
The 802.3at-specced ones are a little more efficient than the af for the same power draw, I'm using them at home in a couple of applications where I'm feeding 802.3af but the power budget is cut a little close.
The 802.3at-specced ones are a little more efficient than the af for the same power draw, I'm using them at home in a couple of applications where I'm feeding 802.3af but the power budget is cut a little close.