It's been a while since I've tried my El Tesoro Anejo, but I might have to break it out tonight. I'm not a big fan of the blanco, but I know exactly why. It's a lowland tequila with a bit more earthy quality and the blanco has a taste of earth and green olives (which I hate). It's a high quality juice, but it's for someone else's palate...not mine.
El Tesoro is actually highlands, from Arandas. But I agree it's very earthy. That's what I like about it. It's interesting you mention green olives because I think El Tesoro 70 has a strong olive oil flavor.