It seems like we're all saying the same things - I agree it is likely that someone who has bought a vacuum before is more likely to buy another. But to make the

It seems like we're all saying the same things - I agree it is likely that someone who has bought a vacuum before is more likely to buy another. But to make the recommendations really shine, it should wait n months before suggesting that again, where n will vary quite a lot by product type - those are the sort of exceptions I'm talking about.