Is the Shark PowerDetect Speed good for allergies?

Yes. It has a sealed HEPA filter that traps fine dust and allergens, which owners with allergies single out as a reason they like it.

How long does the battery last?

Run time is short on the highest power setting and longer on eco mode. Expect to recharge between full-home cleans rather than finish a large house on one charge.

Does it work on carpet?

It picks up well on hard floors and low-pile carpet. On deep plush carpet it is a touch-up tool, not a replacement for a full-size upright.

It weighs 7 lb, light enough to carry one-handed up stairs and to lift above floor level for handheld cleaning.

What comes in the box?

The vacuum, its battery, charger and the standard cleaning tools for floors and above-floor surfaces. Check the listing for the exact attachments included.

Is it worth it over a corded upright?

If you want fast daily cleaning without a cord, yes. If you need deep carpet cleaning in one pass, a corded upright still does more per session.

What do buyers say about the Shark PowerDetect Speed Cordless Stick Vacuum Cleaner IA1121?

Rated 4.7 out of 5 from 33 ratings. Buyers like: Strong suction that picks up debris on hardwood and carpet; Lightweight and easy to maneuver; Battery lasts long enough to clean a whole house or apartment on one charge. Common complaints: Dust cup is small and needs emptying often; Battery could last longer; faster charger or spare battery would help.