Seeing as how it uses the same driver, I would have a hard time believing the PC2000 has less texture of definition or whatever. Since sealed subs have a high f3 point, they will emphasize the mid and upper bass frequencies more. This is more perceptible than deep bass, and can give the illusion of somehow having better sound quality, at least if you are not familiar with the content being played back. Sealed will also generate more harmonic distortion, which can also be mistaken for 'texture' since it is merely a frequency multiple of the fundamental. This is called 'euphonic distortion'.
Also I have a sneaky feeling that Audioholics might have a piece on the SVS PC2000 in the future sometime, if you want to get a closer look at its performance before you pull the trigger.