I ordered this product for my Brother HL-2170W printer. Upon removing this cartridge from its packaging and comparing it to my OEM Brother TN-360 cartridge, I was struck by how different the profiles of the two cartridges were. The original cartridge is slightly larger, and has hubs that hold it in position, plus a locking tab that ensures that the cartridge locks into the drum assembly with a satisfying "click." For those HL-2170 owners out there, you will recognize this as being the tab that ensures that you cannot pull the cartridge out until you depress the little green release lever on the left hand side of the drum assembly. This cartridge has no such tab, nor hubs for that matter. For a while I wondered if I was sent the wrong product, and was a little afraid to install it in my printer for fear that I might break my printer.
When I decided to install the cartridge into the drum assembly, the cartridge fit loosely in the assembly, and I had to press it into place, forming a sort of "friction fit." The instructions on the cartridge, in fact, say to "press the handle of the cartridge until it is placed properly." There was no "click" of the locking tab, and indeed, on my first attempt to slide the drum assembly back into the printer, the cartridge shifted out of position. I pushed the cartridge back in place and reinstalled the drum assembly, but my printer did not recognize the new cartridge until I turned it off and back on again (I don't usually have to do this with OEM cartridges).
Bottom line: the cartridge does work, but I have concerns about its ability to stay in place. If price is your primary concern, this product is untouchable, but if you want it to fit like an OEM, look elsewhere.
UPDATE 6/23/11: This cartridge lasted 18 months, with moderate usage. All in all it probably printed around 3000 pages of text and line drawings (no images). The cartridge stayed in place after the initial scary period, and I'm happy to say that I'll be ordering another cartridge.
UPDATE 1/14/12: This one had a much shorter life, although I'm trying to figure out if I just went through heavier usage. Regardless, it worked well, and the price is still untouchable. I have a sneaking suspicion that these remanufactured cartridges are a mixed bag, so it's possible that the results will vary from cartridge to cartridge. From what I've seen of other reviews, some other customers have received cartridges that look different from the 2 that I've purchased thus far, so "your results may vary!"