I actually just made this move (from Overcast) on Wednesday. I started listening to new episodes from the Castro triage and continued listening to saved older episodes in Overcast, setting the feeds there to not subscribe to new episodes. There was some manual work to walk Castro through my feeds and set individual playback speeds and new episode automatic triage for 30-40 podcasts (the defaults are fine for most, similar to Overcast.) I almost bounced off the move because of that work, but I was done in 30 minutes for 250 feeds, so it wasn’t really too bad.
Result: I’m now experiencing less friction when deciding whether to listen to a new episode, and I’m using a play/pause UI on phone and watch that’s less flakey, so I’m getting through my podcasts faster while enjoying them more again. Unless something surprising happens, I’ll be letting the $20/year premium trial continue to payment.