I am considering using Personalizer for project and have found limited third party metrics for this service. This one article indicates needing TENS of thousands of hits to get good results.
https://medium.com/@EnefitIT/we-tested-azure-personalizer-heres-what-you-can-expect-8c5ec074a28e
Can any one provide any other data?
Obviously, over time it will get better, but does it have to get to 10K+ to get good?