Oh when it comes to design, the Vortex STILL LOOKS IMPRESSIVE. It's simply an exquisite shape, especially when viewed in profile.
As well as introducing the Powertorque, it debuted the distinctive final thumb latch catcher design with the downward chute protruding on the RH side to direct exhaust gasses down and away from the user.
Note there is a tiny raise moulded along the top of the catcher which actually continues and aligns along the top of the Vortex cover!! The Vortex was supposed to represent a new era and is the most pure version of this era.
As for function though, it accomplished the same task as the cheapest powertorque models that cost considerably less if you didn't worry about impressing the neighbours. The only reason the Vortex could be considered quiet was it's supposed operation at lower revs for the same cutting performance as the regular mowers.
It could hardly be considered quiet if operated at mid to high revs, as my neighbour would attest when they close all their windows in response to the sight of it being brought out!