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MassaMax MT339 4D vs Osaki OS-3D Champ II
Which one has the downsides you can live with?
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The short answer
MassaMax MT339 4D ranks higher (#3 vs #4 of 8) and scores better on massage quality, programs & controls. Osaki OS-3D Champ II wins on fit for body sizes, delivery & size.
The biggest complaint about the MassaMax MT339 4D is cramped for taller users; 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
| MassaMax MT339 4D | Osaki OS-3D Champ II | |
|---|---|---|
| Rank in massage chairs | #3 | #4 |
| Price tier | $ | $$ |
| Type | Premium 4D | Full-body 2D/3D |
| Amazon 1–2★ share | 10% | 18% |
| Overall score | 3.3 | 3.4 |
| Massage quality | 4.0 | 3.5 |
| Fit for body sizes | 2.5 | 3.5 |
| Programs & controls | 4.0 | 3.5 |
| Delivery & size | 3.0 | 3.5 |
| Reliability & warranty | 3.0 | 3.0 |
Price tiers: $ under $2,000 · $$ $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
MassaMax MT339 4D
- Cramped for taller users
Although rated for 6'1" and 300 lb, a 5'10" Wirecutter tester felt the torso wasn't high enough, and the body scan set a 5'9" tester's shoulders 'at a weird position,' so programs missed their targets.
Source: Wirecutter - Weak heat
Most Wirecutter testers found the heat unsatisfactory, and three said it 'should have been warmer.' Amazon's summary says some owners find the heat isn't noticeable.
- Overly intense or faulty for some
Amazon's summary says some owners find it very intense on the lower back and functionality gets mixed reviews. A 1-star reviewer says that after about two and a half months it made an odd sound and some rollers hit painfully hard, with no support.
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 MassaMax MT339 4D if
Strong lower-back and foot massage
4D rollers on a budget
Hands-free voice control
Skip it if: You're around 5'9" or taller; Warm heat matters to you; You want simple controls
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
We don't list prices — they change daily. Paid links.