Not sure if this convinces me... Installing a new service on your PC just to search from within qBittorrent? When one has a trusted torrent site where one can check torrent comments & shit? Perhaps I'll give it a try but I'm not sure if it's such a game changer as the author claims.
If you use Sonarr and Radarr, I highly recommend Prowlarr. If an indexer gets taken down or you find a new one, you can quickly add or remove them just from Prowlarr and it'll do the same to your other *arrs.
It's got a ton of built-in indexer options to set it up quickly.
If I'm already using Jackett with Sonarr/Radar and don't really have any problems with it, should I still consider trying Prowlarr? What is it doing differently?
A lot of us use jackett or prowlarr already for radarr/sonarr integration. I use it occasionally to search multiple sites at once and avoid using public torrent sites' front ends.
If you're downloading manually there aren't really a lot of advantages to this I think, unless you search through 10 or more sites every time.
For automated downloads using sonarr/radarr/lidarr/.. it's pretty mandatory.