Are these questions ever going to get answered? If not, there's no real point in asking them...
But I have another one nonetheless.
How do you manage to make these so affordable?
With the current discount, PowerPort II PD 2 (49.5W) cost just $24 when Apple's 5W charger cost $19!
That's not much of a difference in price for two chargers that vary drastically in power output.