Installed these to replace a pair of Alpine SPS-610c components. Love the bi-amped inputs on the crossovers. Out of the box they are pretty bright sounding, however can be tamed with the tweeter attenuation on the crossovers. The crossovers are very large, so keep that in mind with mounting locations. I installed mine underneath the front seats. Woofers are also very deep, had to use a 1" spacer and still remove the decorative metal piece on the magnet.
Overall happy with the sound/quality. Price seems a little high for what they are however, but don't feel like they aren't worth it.