We've tested these cartridges with the original Brother TN-770 Super High Capacity cartridges, and the ones that you can find on Amazon for a much cheaper price. Here's what we have found:
1) The cheaper Amazon new-and-no-brand cartridges were often hit or miss. Most of the time, you didn't really get a full cartridge, or you'd get a cartridge
...Read MoreRead more about We've tested these cartridges with the that would leak somewhere into the printer.
2) In 4 out of 5 cartridges so far, the LD Products cartridges had slightly MORE toner in them than the actual Brother TN-770 cartridges, however. We did have to shake the cartridges once or twice (horizontally/left-and-right shaking) to keep the prints looking great.
3) Additionally, since most Brother printers that use these cartridges have a page counter per type of cartridge, every time we replaced a cartridge, we had to make sure that we reset the toner cartridge setting in the printer to the "TNR-S.HC" to ensure that we got the most prints out of these cartridges. Furthermore, when the printer would just not let you print with the cartridge anymore, we would put a replacement cartridge in, reset the toner setting, and put the previous cartridge back in to use up the rest of the toner. So maybe that have too much toner?
4) Regarding compatibility: You'll probably want to search Google for how to reset your toner setting on your Brother printer. Ours continued to reset to the Starter cartridge (TNR-STR) or the Standard cartridge (TNR-STD). When you replace these cartridges, you'll want to definitely reset the toner setting to get the most out of these cartridges. Otherwise, we have never had any compatibility issues as of yet! Read LessRead less about We've tested these cartridges with the