The Shark Rocket stick vac is the one I bought, and returned due to being excessively loud. You can't begin to imagine how loud that tiny little motor would be, running on 240 volts. Until you get one, you can't imagine the shrill scream of that motor, and it's close to your ear because it's in your hand. The capacity is minimal, it feels heavy in your hand, and the filters dirty immediately. Given a choice between the Dyson hand vac and the Shark, the shark is a better value BUT it's so loud in use that you can't and won't want to, use it very long.
That's not the only Shark canister prototype. Tacony has the prototype for the US version in the engineering department. It was sent to us by the manufacturer (not Shark), as we were thinking of sourcing the power nozzle for a Fuller Brush brand canister. You wouldn't believe how many prototypes we receive from China of machines that appear one or two years later under assorted brand names.