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Kyota Kiyomi M698 4D vs Osaki OS-3D Champ II
Which one has the downsides you can live with?
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The short answer
Kyota Kiyomi M698 4D ranks higher (#1 vs #4 of 8) and scores better on massage quality, fit for body sizes, programs & controls, reliability & warranty.
The biggest complaint about the Kyota Kiyomi M698 4D is pricey; for the Osaki OS-3D Champ II it's auto programs can be too intense. Pick the one whose catch bothers you less.
Side by side
| Kyota Kiyomi M698 4D | Osaki OS-3D Champ II | |
|---|---|---|
| Rank in massage chairs | #1 | #4 |
| Price tier | $$$ | $$ |
| Type | Premium 4D | Full-body 2D/3D |
| Amazon 1–2★ share | — | 18% |
| Overall score | 4.1 | 3.4 |
| Massage quality | 4.5 | 3.5 |
| Fit for body sizes | 4.0 | 3.5 |
| Programs & controls | 5.0 | 3.5 |
| Delivery & size | 3.5 | 3.5 |
| Reliability & warranty | 3.5 | 3.0 |
Price tiers: $ under $2,000 · $$ $2,000–5,000 · $$$ over $5,000 (list price — street prices are often much lower). Highlighted = clearly better (a score gap of 0.3 or more, or a 1–2★ share at least 3 points lower). Scores are explained, with sources, on each product's page.
Top complaints
Kyota Kiyomi M698 4D
- Pricey
Good Housekeeping's only con is that it's pricey compared with the other models on its list.
Source: Good Housekeeping
Osaki OS-3D Champ II
- Auto programs can be too intense
Amazon owners say even the 'gentle' mode is quite aggressive and deep, that they felt a little bruised after day one, and that intensity can only be reduced in manual mode. An 81-year-old reviewer found most programs too rough, and another described the rollers suddenly jumping to maximum.
- Knocking noises and software glitches
Amazon's review summary says some owners report loud knocking noises. A 1-star reviewer says that after 10 months of daily use it began knocking, locking up mid-recline and shutting down. A 3-star reviewer lists bugs: an airbag section not activating, Bluetooth staying connected after power-off, and legs retracting fully in zero gravity.
- Shorter coverage than the ads suggest
Good Housekeeping lists no calf kneading as its con. An Amazon reviewer says the SL-track stops well short of the hamstrings and barely reaches the glutes. Another notes the body scan isn't saved, so it repeats every session.
Who should pick which
Pick the Kyota Kiyomi M698 4D if
Glute, hamstring and calf coverage (L-track)
Users 5'0"–6'2" and up to 300 lb
Tablet-style controls with 24 programs
Skip it if: You're on a tight budget; You want lots of independent owner reviews before buying
Pick the Osaki OS-3D Champ II if
A feature-rich full-body chair around $2,000
People who like deep, firm auto programs
Rooms where it must sit close to a wall
Skip it if: You bruise easily or want a gentle massage; You want calf kneading; You need a compact chair
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