I've never used them but I heard about them in the context of private DNS and VPS hosting. E.g. they act as a middleman to shield domain the shield the client from authorities (at least to some extent — they still have to follow the laws).
Given their focus on privacy I'd trust them for torrenting at least as much as the other options. As a first VPN I'd say it's great because of their flat 5€/m price. A few years ago I used Mullvad for that purpose — until they removed port forwarding.