Allseason tyres are an interesting choice: Auto Express have been pushing them as potentially a better choice for UK conditions than the usual summer tyres, and they may have a point.
My feeling on Contis (based on SportContact 3s, not 5s) is that they do have more of a tendency to go off as temperatures go down than some of their competitors. This may have something to do with them primarily being sold into markets where it is normal to use Winter tyres in Winter, so for them possibly cold performance isn't a key issue.
Anyway, I did see that Auto Express review of the all seasons tyres. It was a shame that they couldn't get the Michelin Cross-climates in time for that test, because i reckon they would have had a shout to run the Weatherrproofs close, but at a price. I would have liked to see how that turned out, if they had been able to get the tyres.
I'd be particularly interested in your comments on wear (when you have put enough miles on them to know), because one of the potential disadvantages of low temperature tyres has been the need to make them from relatively soft rubber, so I'm interested to see how that works out. Maybe, they have found some new trick that improves matters...