We received two sets of these accessory kits, one for our Roomba and one for the Roomba 671 which we bought for our son on opening day. We replaced the main brush, flexible brush, edge cleaning brush and filter on our Roomba. Parts were easy to assemble. Our Roomba cleans better since we replaced these parts with the ones that come with the accessories. It picks up more dirt and fluffs up the carpet better. Our little Roomba has rejuvenated! Edited: A response to a consumer comment will not be posted, so here's my answer: Yes! This is a good kit and the parts match the 671 series, which is similar to our 630 model but with advanced features: connect to a phone hotspot or hotspot with Alexa to start it, schedule it, receive it They provide information about this etc. Our son once asked Alex where he was and 'she' told him that she charges at the dock! In addition, the 671 has a dirt detection feature (the ability to drive around a dirty location after detecting the need). One of the reviews on one site said the 671 doesn't have this, but the reviewer was wrong. You can schedule cleaning by date and time. In addition, the access point can report the number of pollution detection cycles, the start and time of cleaning, and report battery status during use. Worth the money just like this accessory. Our 630 model was purchased in July 2014 and is still running well (especially as we've added spares from this accessory kit). I don't know about the 700-900 models but I can assure you that the 600 models are great and it's smart to buy one of these accessory kits if you have or plan to buy a Roomba 671.
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