I love robot vacuums. They make life so much easier and let you get on with other activities in life. I already had a Roomba so I was excited to see what Shark had come out with.
They are relatively the same footprint size but the Shark has a significantly larger dust bin. This let's you not have to interrupt your new friend quite so often to ensure he is able to eat up everything it rolls across. It also has 2 spinning front brushes (versus Roomba's tri-brush on one side) that look little arms pushing every speck into a hungry mouth. I feel like the arms are equal with Shark edging out slightly as it gets more the first time around.
The wheels on each are pretty similar and let them maneuver around and over things the same. They can go over low profile mats/carpets and edges fairly well for the most part. In my video you will see the Shark get stuck on a new mat that has a curved edge.
The brushes are interesting as Roomba has 2 brushes, one rubber and one bristle. Now Shark has 1 brush, a rubber one, but it gets cleaned off by a bristle edge as it goes around. I find I have less maintenance with the Shark's set up. The Rooba has to be cleaned with almost every session. (I have a lot of pets and I shed almost as badly as them, so there is a lot of fur and hair around).
Now each has a fine particle filter. Shark has a flat one and Roomba a curved one. I feel like they are fairly equal in picking up the fine dust and pollen. Between the litter dust and the grass pollen (of which I'm highly allergic to) our back room would stay a constant battle. The Shark does an amazing job of cleaning it up which has led me to reduce my medication intake for the allergy. The Shark's filter is easily cleaned with a few taps between sessions.
Now the charging stations as the same with the exception being the Shark's obviously includes an amazing hand held vacuum. That little thing is a beast. It is the best hand held vacuum I've come across and I've had 2 other just prior to this one. They are not even worth looking at as Shark blows them out of the water. It's suction is equal to that of the ones at the carwash. Ok, so back to the charging dock. The biggest problem with the Shark is because of this dock. The metal sensors on the dock and the vacuum must be clean for it to make a connection. Like, super clean. For the first 3 weeks I had this vacuum, I only got a partial cleaning session in once. It would always be a dead battery needing to be charged because of it not being on the sensors just so or some dust had blown under it. It would look like it was charged, make a pass off the dock and run home crying about no charge. (Ok it would just make it's sad noise and you had to check the app as to what the problem is.) I was about to write a negative review and just give up on it. I ended up calling customer service and taking to someone in the States who helped me figure it out. It had to be turned off and act like a first time boot up. I finally figured out if the sensors aren't cleaned and lined up so, it will not remain charging. The robot vacuums must remain charging to hold a charge. A bit aggravating when you have pets and kids who bump it (or try to ride it) from time to time too.
Now next biggest difference is the error messages and the app. Roomba talks to you and tells you what it needs (app has more detail for the error) and Shark just makes sad sounds and the app tells you what's up. Now the app just got an update recently for the better but prior to that it was a mess. It was a headache to connect to WiFi and pair the Shark with and it wouldn't really activate the robot when asked too. It would just error out. Roomba is always responsive and let's you schedule sessions a bit more freely than Shark's as well. Roomba also has a dirt encounter detail per session as well. The newer version of Shark's app seems a bit better and more responsive.
Shark does have 2 other settings that Roomba does not offer, a max cleaning mode for extra dirty rooms and a quiet mode for when you are off to bed or maybe have little ones sleeping. The quiet mode will use less suction though and the max mode will use more battery. The battery when fully charged does last a long while, not draining fully after a 60 min cleaning session.
This cleaning system also comes with vacuum attachments for the hand held, replacement brush arms, and magnetic strips to blockage off areas forbidden to the one who cleans.
All in all I do love the Shark, when I can get it work, which seems to be a bit more reliable with the firmware and app update as of 11/2018.
Please check out these look see videos;
The Vacuum in action: https://youtu.be/TwrIaMUJ6hU