I don't mean to say that they make a poor transmission, just that they've had some growing pains.
My Outback's 4EAT towed a trailer regularly over it's 15 years, with regular fluid changes. The 09 Legacy I've got now has the 4eat as well, I'm hopeful it goes 15 years.
From what I've read of it, their CVT is pretty robust. It did have some early issues that are now sorted out. I like when companies learn and improve a part, rather than keep starting from scratch.