Design and Handling
The IP3251 is sold as a complete system rather than just a vacuum. The Auto-Empty dock is a permanent furniture-grade fixture roughly 117cm tall, designed to live against a wall and serve as both charger and emptying station. The vacuum itself stands 115cm tall and weighs 3.6kg without the dock. That is heavier than the Miele DuoFlex HX1 (3.1kg) and the Kärcher VC 6 Cordless Premium (2.55kg) but lighter than the Dyson V15 Detect Absolute. The weight is concentrated toward the handle rather than the floorhead, which makes the machine feel more balanced in hand than the raw figure suggests.
The MultiFLEX wand is the standout physical feature. A hinge mid-wand lets you bend the wand at roughly 90 degrees to clean under sofas, beds and low cabinets without crouching down. Most cordless stick vacuums cannot do this. The same hinge folds the machine in half for compact upright storage when the dock is not the chosen home for it. The dust cup holds 0.7 litres before docking, which is on the smaller side, but the practical impact is reduced because the dock takes over emptying responsibility. The 2-litre base in the dock is where the real capacity sits and that empties roughly monthly in a typical household.
The dock is finished in brass and is the most visually deliberate cordless stick dock on the Australian market. Whether that aesthetic is a plus or a minus depends on your home. It will not blend into the background.
Suction and Performance
Shark publishes two motor figures for the IP3251: an 850W body motor and a 120W nozzle motor. These are input power figures rather than suction figures. Shark does not publish an Air Watts equivalent for the IP3251 in Australia, so direct on-paper comparison with the Dyson V15 Detect Absolute's 240 AW claim is not possible. The IP3251 has three modes: Detect (automatic), Eco and Powerful. Detect mode uses four sensor technologies to identify floor type, edges, dirt concentration and direction of travel, automatically increasing suction up to 75% when dirtier areas are detected. This is similar in concept to Dyson's Piezo sensor system on the V15 but uses a different implementation.
The DuoClean Detect head is the other meaningful performance differentiator. Two brushrolls work together rather than the single roll on most cordless sticks. One is designed for hard floors and fine dust, the other for carpet and embedded debris. The redesigned head also captures debris on the reverse stroke, where most vacuums simply push it along. In practice this means fewer passes to clean a given area, particularly noticeable when working around furniture legs and skirting boards.
The vacuum incorporates Odour Neutraliser technology, with a replaceable Fragrance Puk that sits in the airflow path and adds a light scent to the exhaust air. Whether this is a benefit or a drawback depends on personal preference. The puk is removable for anyone who prefers neutral exhaust air. Shark does not publish a HEPA certification or particle retention rating for the IP3251 and the machine does not carry Sensitive Choice certification from the National Asthma Council Australia. This is a real gap for allergy-sensitive buyers, particularly at this price.
Battery and Runtime
The rated 70 minutes is the longest battery runtime of any current Shark cordless and longer than the Dyson V15 Detect Absolute's 60-minute claim. As always with cordless stick vacuums, that figure applies in the lowest power mode without powered tools attached. In Detect mode, where the machine adjusts power automatically based on detected dirt, expect 40 to 50 minutes of practical runtime on a mixed surface clean. Powerful mode pulls more current and reduces runtime more significantly, though Shark has not published a specific Powerful mode figure.
The auto-empty dock charges the battery from flat in approximately 4 hours. This is comparable to the Dyson V15 Detect Absolute's 4.5-hour charge but slower than the Miele DuoFlex HX1's 3.5-hour figure. The battery is not user-swappable, meaning there is no second-battery workaround for extending continuous runtime. For most Australian households the 70-minute single-charge window is enough for a full clean.
Accessories
In the box: an 8-inch Duster Crevice Tool, a Pet Multi-Tool, a Motorised Hand Tool and a Fragrance Puk. The accessory set is leaner than the Dyson V15 Detect Absolute's seven-piece configuration but covers the most common use cases. The Motorised Hand Tool is the most useful addition for pet households. It is a small powered brush head suitable for stairs, upholstery and car interiors. There is no dedicated mattress tool or extension wand included. Shark sells additional accessories through its Australian site and the IP3251 supports the standard Shark cordless accessory range.
Who It Suits
The Shark Cordless PowerDetect Clean & Empty System is best suited to buyers who want a true whole-home cordless vacuum and who value convenience features over raw branded performance figures. The auto-empty dock is genuinely transformative for anyone who finds emptying a dust cup the worst part of cordless stick ownership. The MultiFLEX wand is the most practical solution to under-furniture cleaning available on a cordless stick. The 70-minute runtime is enough for most Australian homes in one charge. Households with mixed floor types and pet hair are the natural primary fit.
Buyers focused on suction performance and proven brand longevity should weigh the Dyson V15 Detect Absolute at $1,249 against this carefully. The Dyson publishes a 240 AW figure that Shark does not match on paper and carries stronger brand recognition for resale value. The Shark counters with the auto-empty dock, the MultiFLEX wand and a slightly longer runtime claim. Both machines are flagship cordless sticks at very similar price points and the decision genuinely comes down to which feature set matters more to the buyer.
Buyers with allergy or asthma concerns should look elsewhere. The Miele DuoFlex HX1 at $499 or the Kärcher VC 6 Cordless Premium at $649 both offer better filtration credentials at significantly lower prices. Miele holds Sensitive Choice certification, Kärcher has a HEPA filter certified to EN 1822:1998 and the IP3251 has neither. For value-conscious buyers, the IP3251 is also a hard sell. At $1,199.99 it is more than double the Miele DuoFlex HX1's price and the gap is not justified by suction or filtration. It is justified by the convenience of the auto-empty dock and the MultiFLEX wand, which are genuinely useful but not worth $700 to every buyer.