Polanco is old and moderately expensive but if you can get 120+ games out of him, I *really* like him near the top of the Brewers lineup as a stabilizing force around Yelich. He's "pretty good" at everything offensively, something that the lineup badly needs.
If anything, I like this trade quite a bit for the Brewers. If they're targeting Festa and particularly Prielipp, I probably make this trade. I like this trade less for the Twins, as Prielipp is a pretty big loss IF he gets healthy (always a risk).
But the stuff I said earlier in this thread? It's not entirely unrelated to this link, hint hint.
I guess my general thinking behind it is "if the Brewers see something in multiple pitchers, they should probably just make that trade". The Twins are increasingly good with a pitching pipeline but I have more faith in the Brewers' ability to identify something they like in a young pitcher and make the most of it.