Technical comparison
Specification contextSpecification rank #1 among cordless vacuums: published run time 120 min; weight Not comparable. Published inputs, not our lab test.
Published comparison inputs
Published features
Why the specification score is 79
Score uses the exact model's published specification and checked offer; it is not a laboratory result.
Score uses the exact model's published specification and checked offer; it is not a laboratory result.
No comparable weight basis is available, so handling receives the method's neutral missing-data score.
Unknown binary feature inputs receive the method's neutral half-credit, rather than being asserted present or absent.
Baseline exact-model source linkage only. Third-party URL reachability does not increase product score.
Evidence report
What matters, what we know and what is missing
This is a specification-ranked comparison report, not purchase advice. It uses the category evidence profile below and keeps hands-on findings separate from the published specification score.
Controlled or repeatable pickup tests by floor type, debris and cleaning head.
No exact-model hands-on synthesis is published. This report covers sourced comparison inputs, coverage and open gaps; it makes no claim about real-world performance beyond retained sources.
Inside the bounded published category method.
Across 15 factor-removal and weight-change scenarios.
5 blocking gaps remain.
Category evidence needs, decision cruxes and constraints
Controlled or repeatable pickup tests by floor type, debris and cleaning head.
Hands-on state: not collectedTimed runtime with mode, powered head and battery state disclosed.
Hands-on state: not collectedDirect tests with specified hair type, quantity, floor and brush head.
Hands-on state: not collectedHands-on evidence for steering, reach, weight distribution and furniture access.
Hands-on state: not collectedRepeated hands-on evidence on capacity, release, dust escape and blockages.
Hands-on state: not collectedMeasured emissions or a clearly identified filtration test, not filter naming alone.
Hands-on state: not collectedMode-specific noise plus direct evidence on brush, filter and blockage maintenance.
Hands-on state: not collectedHands-on gate: Resolve the exact bundle and cleaning head. A broad performance verdict needs pickup and runtime evidence with floor, debris, mode and head retained.
Published run time and features do not establish carpet, hard-floor or edge pickup.
Maximum run time does not establish realistic powered-head duration or degradation.
Normalized decision receipt
6 mapped fields each carry a canonical receipt hash and an origin status. Source access time is kept separate from field observation, so a configured value is not presented as freshly re-extracted.
sha256:271df9a76112898a7db8984bf76fdafbf6ebba64eced0b2b7b4a6fec824a21c2The score and rank compare retained specification inputs inside this bounded category cohort. They are not a hands-on quality verdict and are not comparable across categories. Open evidence gaps block purchase advice regardless of specification score, rank, offer state or review-synthesis verdict.
Source notes and limitations
Evidence limitations
- Published specifications are not Agent Review Data laboratory measurements.
- The manufacturer-direct source offer and availability can change after the checked time.
- Exact model identity is keyed to the model/SKU in the source register; related colours and bundles are not merged.
- The current manufacturer page publishes weight and bin values on a basis that conflicts with the prior catalogue values; weight is withheld from scoring and the bin value remains unchanged pending a defined measurement basis.
- The five-year registered guarantee applies to the main vacuum; the battery is separately covered for two years.
Recommendation caveats
- The score compares published specifications and a checked offer; it is not a controlled performance test.
- Scores are comparable only within this category.
- Published specification inputs can use different test conditions; the retained values are not treated as laboratory-equivalent.
- Separate third-party sources are shown as contextual evidence, not as a universal consensus.
- The current manufacturer page publishes weight and bin values on a basis that conflicts with the prior catalogue values; weight is withheld from scoring and the bin value remains unchanged pending a defined measurement basis.
- The five-year registered guarantee applies to the main vacuum; the battery is separately covered for two years.
Owner feedback across the web
No trustworthy exact-model owner-review pool was captured on the source page.
Independent tests and owner discussion
Exact-model editorial testing and a separate exact-model retailer pool add handling, pickup and ownership context without replacing the published specification claims.
Shark Stratos IZ420UKT cordless vacuum review: Long-term exact-model review covering pickup, handling, pet hair and battery use.
Checked 29 Jul 2026, 01:00 BST · Independent editorial context; the catalogue does not relabel the review as an Agent Review Data controlled test.Inspect source ↗Shark IZ420UKT retailer owner-review pool: A separate retailer-hosted exact-model owner pool.
Checked 29 Jul 2026, 01:00 BST · Retailer pool is kept separate from manufacturer-hosted feedback and is not treated as internet-wide consensus.Inspect source ↗- Third-party evidence is claim-level context and is not a substitute for a controlled Agent Review Data test.
- Reddit is a self-selected owner discussion source, not a representative survey.
Claim-level trace not yet modelled · 2 of 160 available
This record exposes source-linked inputs and their provenance status, but it does not yet model individual claims, relations and criterion contributions.
Inspect the trace build-out →