Ninja TWISTi Blender DUO SS151

Summary

A compact full-size blender whose lid has a built-in twist tamper, so you can push ingredients toward the blades while it runs. Check the noise and the 34 oz capacity before you buy: it peaks at 105.1 dB and is sized for one or two people.

Strengths

The twist tamper is built into the lid, so thick mixtures get pushed down without stopping to stir.
A 1600 peak-watt motor pulverized 2 cups of ice in under 10 seconds in CNET’s testing.
CNET scored it 9/10 after months of use; Consumer Reports rated overall performance “very good” with “excellent” puree.
Three containers share one blade and base: a 34 oz pitcher plus 18 oz and 24 oz single-serve cups.
Replacement parts are sold directly by SharkNinja, so a dropped pitcher does not mean a new blender.

Weaknesses

It is loud: ShouldIt measured peaks of 105.1 dB, and Consumer Reports rated noise only “fair”.
The base rocks during high-speed blending; suction cups help but do not eliminate it.
The 34 oz pitcher is small for a crowd — one test called it personal or small-family size.
One Best Buy reviewer reports ice clumping in frozen coffee drinks, though other testers had no trouble.
The tamper cannot reach the bottom of the single-serve cups; thick almond butter needed a spatula.
CNET warns the extra plastic parts raise breakage potential, and says the canister is not dishwasher-safe.

Verified specifications

Model	SS151, sold in the US by SharkNinja (120 V, 9.2 amps).
Motor	1600 peak watts; 1100 W rated continuous per the manufacturer spec sheet.
Preset programs	5 Auto-iQ (Smoothie, Extract, Frozen Drink, Spread, Bowl), plus 2 manual programs.
Containers	34 oz Power Pitcher, 18 oz and 24 oz single-serve cups, all with spout lids.
Blade	Hybrid Edge stainless steel assembly with 8 cutting edges (6 long prongs and 2 upper fins), interchangeable across all three containers.
Built-in twist tamper	integrated into the pitcher lid.
Drizzle cap	removable cap in the lid for adding ingredients during operation.
Cord length	31.5 in.
Materials	BPA-free plastic containers and base, with suction feet on the base.
Dishwasher safe	all parts except the motor base, per the manufacturer (CNET disagrees on the canister).
Thermal protection	auto-shutoff with a 15-minute cooldown; manual mode caps each press at 60 seconds.
Warranty	1 year limited; 60-day money-back guarantee for direct purchases.
Dimensions	13.62 × 8.5 × 12.99 in; 7.01 lbs (manufacturer figures).

Full research notes and sources

Blending performance

Consumer Reports rated overall performance “very good” in 2022 testing, with “excellent” puree and “good” ice crush. CNET’s long-term test pulverized 2 cups of ice in under 10 seconds and scored it 9/10. ShouldIt’s five kitchen tests in 2026 scored it 9.1/10, with the smoothie at 9.7 and the protein shake at 9.3. In CNET’s months of testing the 1600 peak-watt motor did not stall on ice, nut milk or frozen fruit.

Twist tamper in daily use

The tamper is the reason to buy this blender. It is built into the pitcher lid: you spin it by hand while the machine runs, pushing ingredients down toward the blades without stopping, removing the lid or scraping the sides. CNET’s reviewer found it genuinely useful for daily smoothies and sauces. It is not a full tamper, though: ShouldIt’s test found that thick almond butter needed a spatula because the tamper could not reach low enough. The 5 Auto-iQ programs are largely variations on pulse-and-pause timing, so treat them as presets rather than separate machines.

Noise, vibration and capacity

Every source that measured it flags the noise. ShouldIt recorded peaks of 105.1 dB in 2026, Consumer Reports rated noise “fair” in 2022, and noise is the most-mentioned complaint in Best Buy owner reviews. The base rocks at full speed; Ninja added suction cups and rubber traction feet to counter it, and it still moves. The 34 oz pitcher is the other ceiling: ShouldIt says it is better for personal or small-family use, not for serving a large household in one go. A Ninja community support answer also warns against putting hot liquid in the blender.

Parts, repairs and running costs

There is no subscription and no consumable; the running cost is breakages. SharkNinja sells every wear part direct: a 34 oz pitcher for $38.99, the blade assembly for $29.99, the twist tamper lid for $33.99, spout lids for $9.99, and the 18 oz and 24 oz cups for $14.99 and $18.99 (SharkNinja, 2026). A dropped pitcher or a worn blade is a parts order, not a new blender. The warranty is one year limited, with a 60-day money-back guarantee on direct purchases. The motor has a thermal shutoff that needs a 15-minute cooldown, and manual mode caps each press at 60 seconds.

Is it worth it?

At $99.99 on sale at SharkNinja direct (2026), it is an easy recommendation for one or two people who blend daily. Between $101 and $120 it stays good value, especially if the twist tamper is the feature you want. Target lists it at $139.99 (2026) and Nebraska Furniture Mart at $109.99 on sale (2026) — at that level, Ninja’s own 72 oz Professional Plus DUO at similar pricing deserves a look. The $179.99 suggested retail is well above what the feature set justifies.

Which model this is

This page covers the Ninja TWISTi High-Speed Blender DUO, model SS151, in Platinum. The US Amazon listing is ASIN B09SBRGSFH. Do not confuse it with the SS150, a closely related variant with 3 Auto-iQ programs instead of 5. The SS151 sits between Ninja’s small personal blenders and the larger 72 oz Professional Plus DUO (BN751); Ninja’s manual also references SS151 color variants HMT, HRD and HSL.