Well I tested mine on two tight roundabouts near home tonight - they were quiet I might add - and it took both at a similar speed to the 405 without fuss - no understeer, and no feeling that the rear might step out at any time.
The 405 would easily outclass many a sportscar on similar roundabouts and twisty stuff - all through my time with it. This 406 definitely feels a heavier car - and these roundabouts are slightly uneven - so maybe it's the heavier feel that gave me more confidence to push it more than I ever dared in the 405.
In addition this one seems much more stable at high speed cornering. I won't quote speeds, but this will take tight motorway bends and slip roads without a murmur, where I had to back off with the 405 due to it feeling like it would come right round on me.
Maybe it's at this point I should make it clear my 405 was an estate, and I believe one with the "stronger" rear suspension (the rear always sat quite high, even when loaded), so maybe I'm not making a fair comparison. But I know this thing handles like a tram now, and is already embarrassing more expensive vehicles so I'm not complaining

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However, time will tell whether I'm paying the price in tyre wear...
