Did not work for me in Brother HL-2270dw
593658
I bought it, installed it, but the Toner light stayed lit and I could not print.  I read about taking the cartridge apart and fixing it, and I'm sure I could to it--but that's ridiculous: I just bought it.  I returned it to Amazon, and I was a little angry since they gave me a credit rather than a refund, but I spent it already to get a real Brother toner cartridge (and a toner refill kit).
3419893
I installed it and it worked just as I expected it should - on my Brother HL-L2380DW. Be careful when taking out the old toner though, you could get some toner on your hands or clothes!
44479
Toner did not work with my MFC7849W at all. Pages only show faint trace of text. When switched to a genuine Brother toner, the print out looks fine.
4197399
Does not work for Brother CS6000i. No place to attach guide onto plate.
216065
This product does not print well at all for the Brother HL-L2300D printer. It leaves a light gray area on the sides of the page after you print (about 1 inch on each side).
3921405
This printer wouldn't install on my computer / Windows 7. I spent about 6 or so hours trying to get it to installed, tried ever suggestion that I could find to try and resolve it but to no avail. I finally called Brother tech support and they tried to figure it out but eventually determined it to be a windows issue not a brother one.  So I was left to search through Windows community looking for a solution. I discovered that many people had had the same problem and that not many of them found a way to fix it. None of the fixes worked for me. Something in windows 7 was blocking the installation, but I couldn't figure out what it was. Turn off all virus protection, etc. But nothing worked. So I'm shipping this bad boy back to Amazon and going with something else.
3846885
The cartridge does not fit my Brother HL-5250DN as advertised. I bought this to keep on hand for when I needed to replace the toner. My return window is long gone.
1519846
It did not fit into my Brother 2270DW printer. There was no locking tab to hold the cartridge in place so it could not snap in.
703692
My Brother printer will not recognize this cartridge!  I bought 2 and the first one did finally work- not the second one.
758889
I used to get as frustrated as you do because this thread is so thin and slippery that would tangle everytime I switched colors until I read the manual of my Brother machine: USE THE NET THAT COMES WITH YOUR MACHINE. (see pic) It is used specially with any thread that winds of quickly. If your machine did not come with it, you can purchase one in Amazon. IT WORKS! :)
707638
After initially setting this printer up for wireless use, I too had the problem with my brother printer being seen by my laptop in offline mode.  No matter what i tried, I could not get my brother to wake up!  My brother would go into a DEEP SLEEP mode and never wake up!  The software will install an icon in the bottom right of your computer screen that should show a green colored check mark.  If the printer is in "offline mode", this icon will be greyed out.  I will say, that running a USB cable to the printer from my laptop turns the icon from grey to green.  THEN using the print function from my lap top would wake my brother up instantly and my brother would print to my every command.

After many hours and days of trying / thinking about what to do, I finally stumbled on a forum that made reference to something akin to a REMOTE SETUP PROGRAM that could be used to change the "deep sleep" mode my brother was in, to something like "just napping".

Try as I might, I could not find such a program specifically for the MFCL2700DW printer.  SO...long story short, I decided on a whim to see if the brother site had updated drivers.  Would you believe this has fixed the issue!?!  My brother's display still shows it in deep sleep mode, but now I am able to wake up my brother and print via wireless.  Everything works just fine and dandy!  I just installed the updated drivers over the old drivers and had no issues from there.

I then used the same updated drivers and installed the printer on my wife's laptop and within a few minutes she was printing from her laptop with no issues.  A tip that worked for us is this...at a certain point in the setup, you will be asked if you want to install the wireless drivers with the use of a USB cable connected from the laptop to the printer.  My very first time of installing the drivers from the CD that comes with the printer I used a USB cable.  On my second install of the newly acquired updated drivers, I did the install without the cable and it installed without issue.

I'm not sure if using the USB cable or not has anything to do with the wireless installation being successful or no, but not using the USB cable with the updated drivers has worked just fine for 3 laptops at my home.  Hope this helps.

My four star rating is due to the drivers being shipped with the product that caused me a lot of grief.  The printer does take about 15 seconds to wake up before it starts to print from my command of print, but once printing, it prints fast.  So just be patient.  I've never had a laser printer before but after spending so much time and money on inkjet printers whose ink dries out or something happens with the inkjet head, I decided to go laser.  My father in law has an old canon non wireless inkjet printer we use for colored printing.  I would have purchased the wifi version of his canon printer had they still made it.  After years of use, it's still going strong and the ink never dries out.

So far so good with my brother.  He's been a good brother to have around...if you need just a black text printer, this seems to be a keeper.
738736
Perfect printed copy now.
Initially, I had the problem that the drum worked for about a day, but then the printer light said that the drum needed to be replaced.  The printed output was fading out, especially on the left side.  It was fixed by following the following directions from the vendor:
> Please reset the drum counter only when you replace the drum unit. If you
> reset the drum counter during the life of the drum unit currently being
> used,the remaining drum life will not be displayed accurately.
> 1. Make sure that the machine is turned on.
> 2. Open the front cover.
> 3. Press the Go button three times and close the front cover. If you do not have a Go button, go to Step 4, otherwise you are finished.
> 4. Note: The layout of a control panel differs depending on the
>  model,but the 'Clear' or 'Clear/Back' button is located on the right
>  side of the LCD screen as shown in illustration. Press 'Clear' or 'Clear/Back' on the control panel.
> 4. Do one of the following:
>  a)If your Brother machine has a numeric keypad:
>  Press 1 to reset the drum counter.
>  b)If your Brother machine doesn't have a numeric keypad:
>  Press the 'Up Arrow' Key to reset the drum counter.
> 5. When the LCD shows 'Accepted',close the front cover.
>
> If the printing on printed output is still fading out,please try to
> replace a new toner.

;
460737
I bought this to replace the drum on a Brother HL-1440.  The Amazon listing and a sticker on the drum all say this works on an HL-1440 and replaces the drum # DR-400.  Right out of the box it is not working.  I have the opposite problem that most people are experiencing - the pages are printing completely black.  Looking at the drum it is completely covered in toner so it is obviously not getting cleaned off.  (I know the process is a lot more complicated than just getting "cleaned off", but that is the basic result needed and this drum is not doing it.)  I put the old drum back in and it works fine - so it is not the printer or the Toner cartridge.  Judging by the reviews these are hit or miss and work for some folks which is a HUGE savings over an OEM Drum, but if it does not work like mine it is a small waste of money. (Unfortunately I did not install it until it was too late to return.)  So I guess you have to decide... "What's it gonna' be Punk - Do you feel Lucky?"
1468820
The product was not compatible with the LC-61 Series for my Brother Printer.  The description did say that it was compatible but it was not.  Sorry.
4962128
Bummer, black worked OK, but not cyan.  The cart doesn't snap in. The box says it's compatible with 435w but the label on the cart itself doesn't list the proper brother manufacturing code (LC71C for cyan). The codes are here for the bro 435W

[...]
1209817
This says on the box that it is compatible with Brother printers MFC-7440N but it isn't! And now they will not let me return it!! Not cool
43341
This product is not compatible with my Brother printer MFC series and now I can not return it either or get replacement