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Input:
Question: I have a long-haired cat & the hair gets into the gears (gives continual error 2).  Does this assembly also prevent hair getting into the gears?
Document: I've owned Roombas for years and it's been a love/hate relationship. I can't keep myself from buying them but I've always been disgusted by the quality (lack of) of the accessories. In particular, the brush assembly. Admittedly, I do have 3 dogs and 2 cats so my Roomba earn their room and board, but the brush assembly sucked gunk into the gears with amazing speed.
I bought this for my 4 year old 500 series with the hope that it would increase thr effectiveness of MY Roomba. I've used it about 3 times since installation,  and it clearly does a better job cleaning up pet hair and otjer debris. It also runs cleaner, seemingly not getting hair tangled in the brush or rubber sweep.
Fits model 551. Stops the error 2 from occuring so often. VERY glad  I purchased. Replaced both of mine with this.
A good buy at this price. This lets me actually upgrade my 565 roomba with better modules and this really did clean a lot better and pick up more pet hair and looks like the design will keep hair from getting into the gears, which was what destroyed the orginal module.
I had to repair my Roomba, Timmy, as it picked up so much long hair after my wife moved in that the brush assembly broke. (That and she ran it every day for a week while I was away on business without realizing that she needed to actually clean the thing...)This was an easy fix: pull out the old one, pop in the new one.... and Timmy worked like new all over!
I have been doing Roombaectomies for years and was flabbergasted when I didn't find a dog and half a cat in with the gears. Wow!
We got our Roomba 560 in December 2010. We have three dogs and really appreciated the daily vacuum; however, the brush assembly could not handle the dog hair and we needed to clean it frequently and even take it apart (down to the gears) to remove the hair jammed between the gears. The clogging was so bad that we had to replace the entire assembly three times in the last three years.
Finally,  Less noise and clean brushes on my 500 series. I originally cleaned and oiled the original gear box ( gears were full of hair )  it improved it for awhile. I bought this upgrade and it works great. No need to clean or oil the gears yet. I am happy.
We still need to remove hair from the brushes weekly, but it has been running like new for the last three months and it does not look like any hair is making it into the internal gears. It is really like we have a new Roomba. I cannot recommend this part highly enough. By the way, I love Amazon Prime, but this part is cheaper at the iRobot site. I am pleased to see that iRobot is not taking advantage by charging too much for the part. Buy it!
This new head corrected a short coming of the original head. The original head gets clogged up with carpet fiber or hair and needed to be cleaned constantly. This new head has corrected that problem so when we are using it on the persian rugs we have on the hardwood floors, it picks up the dirt and does not clog with hair/fibers.......very happy we made this purchase.....
Answer: I've found it's a significant improvement. It doesn't prevent it completely though. I used to have to clean after every run and had errorr 2's about half the time. Now I clean every other run and have only had 1error 2 in probably 20 runs.