B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
16%
16% -- perceived quality lift for espresso machine product reviews (2026)
An espresso machine was perceived as 16% better when positive reviews were accompanied by a negative but mostly irrelevant review.
- Underlying study details are paywalled
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
16%
Unit
Percentage
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Science Says
Primary
Tier C
https://app.sciencesays.com/p/some-negative-reviews-are-good ↗
Source Article
Some negative reviews can be good for you
Original Research
Science Says
· Original study ↗
Methodology
Research finding summarized by Science Says; underlying study details paywalled
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
espresso machine product reviews: 16% perceived quality lift. Source: Science Says (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/espresso-machine-perceived-16-percent-better
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<blockquote cite="https://lighthousedata.io/data/espresso-machine-perceived-16-percent-better" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>16%</strong> -- perceived quality lift for espresso machine product reviews<br><small>Source: Science Says (2026) · <a href="https://lighthousedata.io/data/espresso-machine-perceived-16-percent-better" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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