I went with Valvoline CVT as I was able to get it locally for $7.99 vs. $13.95 for Red Line, which was actually the next cheapest one I found and would have to be ordered. (There is something called "Syngard CVT" which is $6.99/qt on Amazon. I couldn't find out anything about it, so no go on that one. Lubegard also makes one but it's even more than Red Line!)
I drained the trans, then poured in one quart at a time until I had replaced as much as I took out, which was about 6qts. I drove the VUE around the block and the trans didn't explode, so I guess it'll be ok.
CVT fluid is nothing like any ATF I've used. It is crystal clear, doesn't feel "slick" between your fingers, and it pours even more rapidly than Dex VI.