We bought the Stratos to upgrade from our previous Shark. The Stratos has great suction, and the soft roller in the front doesn’t get clogged with dog hair as our previous Shark did. We would constantly have to stop, remove the roller and pull out the clumps of dog hair. (We have 5 long haired dogs!). But with the Stratos, it doesn’t clog!  It has awesome suction, as I mentioned previously. At first I thought it was “dragging” as I pushed the head across the tile floor. But then I turned the machine off, and it was easier to push.  Simple one hand operation to remove the collection canister and dump it.  One down side, the machine is noticeably  heavier than our previous Shark upright, which is why I gave it a 4 out of 5 stars.