My primary use is listening to operas on Blu-ray or DVD. I have taken the time to let the speakers break in and to listen to dozens of operas on Blu-ray and DVD as well as on CDs.
Not that much is routed to the subwoofer in these sources, but I enjoy the visceral sound when it kicks in. In live productions the applause has lots of bass. In a production of Handel's Admetto re-imagined in medieval Japan, Hercules costumed as sumo wrestler has to lift up one leg high and stomp the wood stage with his bare foot. With the volume set for the singing that sound shook my house. if you are strictly an opera buff and on tight budget, you could skip buying the subwoofer.
The more important aspects of the sound for opera are the clarity and projection of the spacing. Because there was a delay with shipping the tower speakers, I initially set up the system with some good large bookshelf speakers. Switching to the Aperion towers made an immediate improvement. The surrounds provide a great feel of the opera house. These system is an excellent value because they can fill a 25' by 20' room at high sound volumes without distortion.
By the way, using the meter to set the balance made a big difference. The automatic balance adjustment in the Onkyo receiver was worthless.