The dashboard is incredibly clunky and at the time they didn't have SSL for db connections (not sure about now). A lot of stuff you need to know what you're doing like configuring tags for Traefik etc.
The deal breaker was it didn't have zero downtime deploys. Any pending request when you update an app is simply killed.
I was expecting something like Heroku or Vercel but this ain't it.
Ended up concluding that if I wanted to run/deploy apps on my own VPS I'd just use Kamal or Dokku. Both have zero downtime deploys, certbot, proxy, etc.