I bought this vacuum in June 2025 and I have to say for the price I think there are better options out there. I love the empty feature and the auto detect is a nice feature. My gripe with this machine is that EVERYTHING gets stuck in the opening of the head. This really is a design flaw. Of course I try to pick up everything before vacuuming but with 4 kids and 2 dogs that is nearly impossible. And I’m constantly having to clear that opening. It’s frustrating and had I know I might have chose a different vacuum. I’ve never had it run out of battery on me and can go a long while before emptying the tank. Just wish the head was built differently. If you have no kids and purely dust on your floor I’m sure this perfect. But if you have a tissue or that hidden wrapper somewhere, good luck!

I had originally purchased a Dyson v11 and I was very disappointed when it wouldn't even vacuum up my cats food. I kept seeing advertisements for the shark cordless powder detect and couldn't stop thinking about it. I ended up sending back the the Dyson and ordering this and I am so happy. I've only had it a few days now. But completely satisfied.

I bought my shark BU 3521 about 2 1/2 - 3 months ago and it was the best! I loved it, I never had a stick vacuum before. The handle with the battery broke off so it’s unusable now and I don’t have the box or receipt so I can’t get a refund. I think the handle with the battery attached to it without any reinforcement is too much strain.

I’m absolutely loving my new shark cordless vacuum and I love how my hair does not get trapped in the roller head. I love the lights on the head and how when you vacuum the edges it sucks higher. I would not change a thing. I love automatic emptying every time I vacuum.

This vacuum does exactly what I hoped it would do. We have six cats and bare floors, and despite liners and litter rugs, they get cat litter on the floor. This vacuum with the counter rotating rollers picks up the cat litter without flinging it behind the roller head. All other vacuums with a roller make picking up the litter tedious. I can now vacuum the house in about half the time that I could with our dyson and other vacuums.

While I only purchased my Shark Cordless PowerDetect Clean and Empty Stick Vacuum approximately 6 weeks ago, I gave it four stars. So far it lives up to its description. Time of course will tell if it lives up to its reputation. I am extremely pleased with everything it does and particularly love the Clean and Empty feature. I hope to bump this up to a five star rating soon.

Had for a couple of weeks. Great vacuum. We love the soft roller with the brush behind it. Our old cordless vac was fine, but only had spinning brush. To test how effective it was for dust, I sprinkled a bit of baby powder onto the vinyl plank flooring. Bet my wife it wouldn't pick it all up. I won. Had to go over it three or four times. You can prove the same thing yourself with a broom versus a dust cloth. Same principle. I'll order a second roller to put in while the first one dries when I decide it needs to be washed. Also love the self emptying feature. Saves a lot of time.

[This review was collected as part of a promotion.] Does it have provisions for thermal protection with a reset? Front roller Jammed and the unit shut down. Battery required recharging. Also requires that when vacuuming carpet that it runs smoother when going in the direction of the nap. Unit is the power detector self exhausting

I have only had this a couple weeks but so far absolutely love it! We are a ranching family so our vacuum gets a lot of dirt, straw, dust, not to mention dog hair from our 2 Aussies. It has been amazing so far. This was purchased to replace an older Shark cordless vacuum but I feel the PowerDetect makes a huge difference.

Bought for Black Friday. Opened it today, finally. Was so excited, but it didn't last. Works beautifully with hand held system, although i did have some issues with getting pet hair to empty. But there was nothing on the floor attachment to hold the blue front brush in. it fell out the first time i lifted it out of its packaging. For the price point that is just ridiculous. i love my regular Shark vacuum so much I bought one for all my family members. Glad i didn't buy them this one, :(