I've not tried the Turanza 6s - I've done 1000s of miles on Turanza t005s - from the reviews it looks like the only changes are an overall improvement of wet performance to bring them inline with newer tyres than the t005 and a slight noise reduction.
Negatives:
The t005 were not noisy tyres but the noise they made was a constant dull droning which was a bit irritating after awhile - dunno if they've improved that.
I've had premature crazy cracking between the tread blocks on more than one set.
When it was properly dry as in dusty dry and warm they felt vague and heavy, though most days in the UK don't get like that.
Quite soft sidewalls which don't seem to handle the lateral forces of high centre of gravity/heavier type vehicles to an ideal level - which might be contributing to the premature cracking.
On the positive side:
The rolling resistance, wet grip and control when braking I found excellent - few very tyres I felt as confident in when say passing a lorry on a dual-carriageway with torrential rain and standing water.
I can't say how much they've changed with the 6, but from reading around I suspect some of the negatives are still there.
) the back of the car definitely feels a lot firmer and more "planted", especially in the wet weather today 
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