Received my PC12-NSD right after Thanksgiving; arriving quickly after purchase. I'm a new sub owner, so all I can contribute as a newbi is a jaw dropping WOW! Started looking last March for a for a sub. All paths kept leading to SVS. The forums recommend sending room dimensions to SVS, so I gave it a shot. From that point on, I have been impressed by SVS customer service (Ed was tremendous, answering all questions). Based on my room dimensions and placement challenges, the SVS recommendations was the 20-39PCi. However I ended up waiting for the PC12-NSD – and very satisfied with this choice. My decision was based on observations that SVS has a history of making performance tweaks to their products.