iRobot Roomba 650 Robotic Vacuum Cleaner (Vacuum + Replenishment Kit) From iRobot Report Feedback
Last Updated: 7/29/2017
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Most Trusted Reviews
- Verified Purchaser
- Critical Reviewer (avg. rating: 3.5)
Least Trusted Reviews
- Verified Purchaser
- Contains repetitive phrases (show)
- Single-Day Reviewer (posted all reviews on Jul 15, 2016)
- Overlapping Review History: reviewed 1 of 9 top products
- Easy Grader (avg. rating: 4.8)
4.2 Product's Average Ease Score
4.1 Category's Average Ease Score
Read more about our Reviewer Ease test.
44 of the 5,318 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.8 while reviews without substantial repetitive phrases rated this product an average of 4.4. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
from the same brand
285 of the 5,318 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.6 while the reviewers who have a more unique product review history rated this product an average of 4.4. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
Example critical reviews
-0.5 average net helpfulness for positive reviews
-2.9 average net helpfulness for negative reviews
Read more about our Skewed Helpfulness test.
We discovered a total of 17 deleted reviews for this product, with an average rating of 4.4. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
4.4 average rating of deleted reviews
Read more about our Deleted Reviews test.
- Created over 69 days
We counted 5,318 reviews for this product over the span of 1,781 days, an average of 3.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 10 or fewer reviews on any given day.
However, we see the following 69 days exceeding this threshold:
403 of the 5,318 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.
- From reviewers with an overrepresented participation
We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:
486 of the 5,318 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
- Have an overrepresented word count
Read more about our Word Count Comparison test.
1 of the 5,318 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Read more about our Incentivized Reviews test, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.