very well so far: 4000 pages / 11Monate

Because of the low price compared to the original and previous positive review I bought this toner cartridge.
I now have about 100 printed pages and am so far with all highly satisfied (delivery, packaging, shape / stability of the toner cartridge, print image).
Since I am a high-volume printing - with respect to the printer - have (approximately 500 pages / month), will then also soon show how the yield of pages / cartridge is here.
Brother Original toner TN-2220 ("Jumbo") I came to the last 3 cartridges only to 1843, 1812 and 1694 pages (instead of the promised 2600 pages at 5% coverage) before the printer went on strike even after repeated shaking the cartridge and the printed image was faulty, what bothered me the price of the original solid (see review here).
I'll post here if the quality issues and how much sides held the cartridge.

Update as of 05/18/2013: still everything great - as if it were an original cartridge.
Update as of 10.02.2013: As my print volume has gone down, I'm only now arrived at 1460 pages - and the printer message "Toner empty". By pressing a key combination to one that can fix well. Annoying. Print remains perfect.
Update as of 02/10/2014: I am now arrived at 4000 pages and have never had the feeling that they have no "original" element. Better it can not be. I just ordered a new cartridge, because now the device (again) reports "toner empty". Let's see how many pages I can still rausholen :-)
Update as of 07.29.2014: At 5000 pages, the print image will be weak. Shake the toner helps - and it goes on ... Never again buy original Brother cartridges!