I'm clearly in the minority, but the new app is leaps and bounds more usable and stable for me. The functionality gaps don't affect me - those features weren't things I used. And it's way, way more responsive and consistent than the old one.

Perhaps it's just my specific network situation. The old app was a constant headache of inconsistent state - music playing while it showed nothing playing, pressing commands (like skipping a track or pausing) but those commands never happening on the device. It also took a very long time to show my entire device list. Never quite worked with the Roam like it should have.