buytoplab is an independent buying-guide site. We do not run a laboratory and we do not pretend to. This page explains exactly how every “best X” guide here is built, where the evidence comes from, and where our method falls short. Read it before you trust any ranking on this site.
1. What we do — and what we don’t
- We do not run our own test lab. If a page says a product was tested, we name who tested it. Otherwise treat our lists as evidence synthesis, not first-hand testing.
- No paid placements. A brand cannot buy a spot, a score, or a softer “Downside” note. We may earn an affiliate commission when you buy through our links — that never changes the ranking order.
- No flawless picks. Every product we recommend carries a stated downside. A list where everything is “amazing” is marketing, not a buying guide.
2. The four evidence layers
Each product is judged on four inputs. None is enough on its own.
| Layer | Weight | What we look at |
|---|---|---|
| Market data | ~30% | Sustained sales volume and rating counts on major marketplaces. High volume over years is hard to fake and exposes models that quietly fail. |
| Independent testing | ~30% | Published results from reviewers and labs that state a method — for example Consumer Reports, RTINGS, Wirecutter, and category specialists. We prefer measured numbers (suction, decibels, runtime) over impressions. |
| Long-term owner reports | ~25% | What breaks after month three: reviews sorted by recency, recurring failure reports, warranty complaints, and owner forums — not just the 5-star front page. |
| Spec & value normalisation | ~15% | Like-for-like comparison: real capacity vs claimed capacity, price per usable feature, and running costs such as filters, bags, desiccant, and energy. |
3. How a score is built
We rate each finalist 1-5 on five criteria, then weight them:
- Performance — does it do the core job well, and hold up at the edge cases?
- Reliability over time — failure and return patterns after the first months.
- Value for the money — performance and features per dollar, including running costs.
- Usability and setup — how much friction is there in daily use?
- Support and parts — warranty terms, replacement filters/brushes, and whether parts stay available.
4. Why every pick has a “Downside”
A downside is not a token. It is the single reason a well-informed buyer would choose something else. If we cannot name one, we have not looked hard enough.
5. How often we update
- Every guide is refreshed quarterly, with prices re-checked monthly.
- Each guide carries a dated Update note at the bottom.
- When a pick changes, we say so in the update note rather than silently editing.
6. Where our method falls short
- Not first-hand. We can miss unit-to-unit variance that only owning the product would reveal.
- Long-term reports skew negative. People with failures write more than satisfied owners, so we weight recency and recurring patterns, not raw complaint counts.
- Prices move. A value pick can stop being a value pick after a sale ends. Always verify at checkout.
- Coverage gaps. Brand-new models may lack the sales and reliability history we require, so we may not rank them yet.
7. Corrections
If a price, spec, or pick here is wrong, tell us and we will fix it and note the change. Accuracy beats ego.
8. Affiliate disclosure
buytoplab is reader-supported. Some links are affiliate links, and we may earn a commission if you buy through them — at no extra cost to you. This is how the site stays free and independent. Commissions never influence our rankings, scores, or downsides.
FAQ
Do you actually test products? Not by default. Our standard method is evidence synthesis from independent testing, market data, and long-term owner reports. When a page references a specific test, we name the tester.
How do you make money? Through affiliate commissions on links, at no extra cost to you. Brands cannot pay for placement or better scores.
Why do you list a downside for every product? Because every product has one, and hiding it does not help you choose. The downside is the fastest way to rule a pick in or out.
How current are the rankings? Guides are refreshed quarterly and prices are re-checked monthly. Each guide shows a dated update note.
Can I suggest a product or report a mistake? Yes — corrections are welcome and we will note any change made.
Methodology last reviewed: September 2026.