You can use any charger n not necessary must use the supplied unit. Infact I never bother to use any of the supplied chargers n cables in all my phones
I only use my 2.1A usb ipad charger n htc or Nokia or Blackberry cables to charge . Has been faithfully doing it for past 7 years. . .The phone has built in circuitry to control current input - nothing to worry about using alternatives. Note2'charger I remember is 2A . Just choose any as long as its output is similar or higher. A lower output charger will charge it slower...I didn't even check the default charger output as 2.1A is already one of market highest

This OPPO is a special type of fast charger meant for Oppo phones (with built in circuitry to take such a high charge) ...as a precaution I would stay away from it. I just checked - the X1 charger output is 2A. So using those Samsung Note chargers shouldn't be an issue at all

From some online article and sharing. The oppo charger has an extra 2 pin that can detect whether ur phone is capable of rapid charge or not. So if urs phone micro usb does not match with theirs then it will not output of 4.2A

Received the new casing, Cocose Shockproof. Protects all edges. Feels secured
A bit bulky, but no otger options left. My tpus haven't arrive..

try out one of hese waysn to get the pull down:
https://play.google.com/store/apps/details?...ullScreen&hl=fr
or
http://forum.xda-developers.com/showpost.p...14&postcount=44
or
http://forum.xda-developers.com/showthread.php?t=2453926