I just upgraded the Sierra 2 EX to the V2 version. The improvements are apparent, not huge, but well worth the cost of $135 per speaker. It's more linear with better in-room response and off-axis behavior. Subjectively, it seems warmer with more spaciousness than the EX, which was already a fine speaker, itself. Having an NFS during the speaker's developmental phase is a game changer for Ascend. Well done.