With regards to the quality of the eBay chargers:
I personally used to flip these chargers for a profit. I also happen to know a great deal about lithium polymer, and lithium ion batteries, charge rates, capacities, lifes, storage charges etc...
Let me just say that the chargers coming out of eBay are actually very impressive. Compared to the apple chargers they give out 80% of the wattage; and this is a
good thing because the slower you charge lithium polymer or ion batteries, the more effective cycles you will have on that battery.
The chinese chargers on eBay also have a
far better connector compared to the apple ones. The apple equivalent rips apart so easily it isn't even funny..
I love apple, don't get me wrong. but the quality of their USB chargers, earphones(
especially), and AC chargers are absolutely horrid. I really don't understand why Apple hasn't improved them over so many years. As a piece of trivia, apple earphones have a frequency response worse than earphones you'll find at the dollar store.
Below you will see the comparison of the new in-ear apple buds(90$ +), a randomly selected sony in-ear ($90+), and an 86% accurate etymotic inear (130$~). The curve you
want to be close to is the blue one..
http://graphs.headphone.com/graphCom...hID[]=1703
I hope this clears it up.