I bought this from honk kong as well, just got mine yesterday too, took 17 days, which is with his 14-21day given time frame... i'm pretty sure charging just the battery is much better than using a usb cable with it to charge the one in the phone.
if i remember correctly, this is 4.2V and the stock EVO one is 5v... i think 1A also as apposed to the .8A this charger puts out.
IMO the 5V 1A from HTC is because the phone is a powerhouse and need the extra push-power. But if you are just charging a battery with this, then all should be well.
Basically, if you're looking to get a quick charge on the battery IN the phone, this is not the USB charger you want. But its a BEUATY for my spare batteries now
LOVIN THE BRIGHT CHARGING LIGHTS!