Ive had 3 sharks.
One was a corded wand style which was great for my small condo. 6 years and never a single issue. Ended up selling it for almost as much as I bought it for. Keeping the box seems to help.
The second was an upright that worked flawlessly. I forget the name. Unfortunately the wand was designed with rivet bolts that would strip away when you adjust the wand, making the wand unusable. The vacuum itself worked perfectly.
Shark sent me a stratos as a free replacement and it does not have a riveted wand and is way better built. So far no issues. The deodarizer puck is a gimmick but damnit i love that fresh scent of clean carpets.
So yeah, 3 sharks, no problems other than rivets (which could have been diy repaired but I wanted free upgrade).
I think I just carpet bombed dukes