I'm still having issues getting my premium podcast feeds to update. I'm 99% sure that I have the correct feed URLs, but every time a new podcast comes out I'll either have to delete and re-add the feed to have it update, or just give up and listen to the free version.
It's not a huge deal because the ads are sort of funny anyway, but I'd prefer to listen to the premium podcasts if possible. I'm trying to access them on iOS 8.3 using the Apple Podcasts app, or Overcast. I'm also trying to access them on iTunes 22.214.171.124 on my Mac (OS 10.10.3). I'm not sure if it's an issue with the apps I'm using, perhaps they're not able to recognise an update in the feed, or maybe there's an issue with the feed itself. These are the feeds I'm using: