In all fairness, a lot of us considered it a pretty clever design when it first came out. Dyson is attempting to do things differently, and that always means some things will work and survive, others will drop out due to natural selection in the market. Twenty years from now, the latter will be regarded as rare classics and emblematic of their era.
The criticism I would raise about the Dyson unit is that when you have two drums rotating in opposition to each other, the bearing or wearing surfaces where the drums meet will get double the wear compared to the equivalent surfaces that are not subject to the contra-rotating action. On the other hand, they did claim to have tested the machine to 20 years' usage equivalent, and the concentric aspect of the rear tub half is clever, in that it distributes the stress load rather than concentrating it at the front face of the rear half.
So I guess we'll see how these do over the years.
And in any case, any instance where physical goods are actually being manufactured in the UK or the US is a good thing in this day & age.