I can recommend it. I have a setup with Sonarr, SABnzbd and Kodi plus a sub to a nice European usenet server. Hardware is my desktop, a 4 TB NAS and a fireTV. All told a few hundred dollars and TV shows show up automatically for me, often within an hour of airing.

This is the first I have heard of Radarr though. (Sonarr but with Movie retrieval). I'll have to check it out.