The plan is much more than the typical "pay to remove ads" plan. We've invested big time in a bag of genuinely useful features, and we'll continue to do so. We know these are genuinely useful because the user community has been asking for these features since day one. We rolled up our sleeves and built them for you, and we think they are worth the price for anyone who uses the app regularly.
Premium members - offer cloud-synced play history, custom themes, Space Saver audio compression, playlists, bookmarks, and much more. They also include cloud-intensive features targeted at people who take their podcasts more seriously - automatically create personal backups of all audio in your playlists, search full show notes within your subscriptions and playlists, and get priority feed updates courtesy of our fetch servers (typically within 15 minutes for most of your subscriptions).
You can get full details and screenshots within the app, from the "Upgrade" option in Settings.