He's been outstanding. He had a lot of skeptics who didn't think he'd be able to repeat last year's performance, but his numbers are extremely good. 12.35 Ks/9 makes his mediocre walk rate acceptable. The strikeout is such a huge weapon for him, and he's just about as good as there is in that department. In fact, Fangraphs has him as the seventh most valuable reliever in baseball so far. Aside from that hiccup to start the season, and that stretch about a month ago where he was allowing a ton of baserunners (and still getting saves), he's been dominant. He should be one of the Brewers' many All-Stars.