Hi Daniel
So I have had my car for 10 days now and they have been pretty cold days too.
I was worried that the Advance didn't come with heated seats (a luxury that I have enjoyed on previous cars) but Chris at Lexus Hatfield explained all about the Tahara seats and said that they weren't as cold as leather ones. I put this down to him being a salesman (I had just had a couple of hours of BS from a Merc dealership) and decided that with the savings made between the Advance and the next model up I could do without!
Chris was right, they are absolutely fine, much warmer than the wife's Shogun leather seats (although that does have heated seats)
We also have a 4 year old boy that thinks EVERYTHING is a climbing frame. These seats are really good, unlike leather they don't need any treatment, just a wipe with a 'baby wipe' to get marks off, they are warm and look very nice. Chris also said that they wouldn't crack or crease like leather ones do over time.
As for the wear and tear, ask me again in a year but all indications are that they are fine.
Oh and they will also appeal to Tree Huggers (sorry, but I like that phrase)
Seth