Top positive review
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At least from Amazon, this is 100% Brother original cartridge
on 28 March 2014
Other reviews advised this may not be a Brother original. Possibly purchased from other third party vendors that may be the case, but I can confirm the version sold directly by Amazon is 100% original.
No comment as to how long it will last, but it came in illustrated blue Brother box (no brown cardboard outer as I had requested Frustration Free packaging), with inner compressed-paper side protectors, installation manual, mailing label to recycle old cartridge and new cartridge sealed in silver-coloured vacuum-sealed bag. Cartridge has Brother logo in raised typeface and is identical to the factory original which came with the printer (though that was 700 pages capacity and this replacement is 1000).
NB - the cartridge sits in a plastic cradle/retainer within the printer. The whole mech (cartridge plus cradle) is withdrawn, the new cartridge inserted (after removing orange plastic protector marked 'REMOVE') and then swipe the green sliding tab across the roller a few times to clean the corona wire, leaving it docked in the leftmost position from pov when installing new cartridge.