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Repetitive ... useless ... information.

How much does "My daughter loved the gift. Sue K., Topeka" add to your impression of an offer or product?

It's non trivial. If you heard someone liked it, you're more likely to buy it.

If it's an actual review on a trustworthy 3rd party site, yes. Otherwise no, as most of these testimonials are just completely fake.

well, if Sue K liked it...