I have a 2010 (so about 8 years old) SR5 premium with about 95,000 miles on it. My seats still look fantastic. I’m the second owner so I don’t know how the first owner cared for them, but I condition my seats every few months as I see it needs it. My seats really look great. I’ll grab a picture to post.
For reference, I’m an athletic 195 pounds.
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I think that’s real leather in your 2010, and they didn’t start using Softex until later. That actually looks identical to the leather in my wife’s 2012 Limited.
As for Softex, I think it should wear extremely well (as in better than leather) assuming Toyota did their homework. Like someone already said, the Germans have been using synthetic leather a long time and I always heard it was durable.