As the others have mentioned, the most significant contributor to "accuracy" is your frequency response curve which is the result of the subwoofer interaction of the room.
Below is a outdoor frequency response of the HSU VTF-15:
Here is the frequency response of the HSU VTF-15 in a room:
As you can see, the room affects a subwoofer's native frequency response.
I made the mistake of upgrading twice (to a JL Audio F113) before realizing that my perception of a one note subwoofer was not due to my subwoofer, but a null in my frequency response curve.
My suggestion would be to measure what your frequency response is. If it is relatively flat, then upgrading to a better subwoofer will likely be effective. If it's due to an even frequency response curve, I would see what happens after you fix it (i.e. EQ). Buying a bigger, better subwoofer in this case may not correct your issues, as it was in my case.
So back to the PS-1000 it is nice, except that when I am not in the theater room and my wife is viewing or listening to content all I can hear is a one note sub.
As the others mentioned, that is going to occur regardless of what subwoofer you buy. Bass quality (and hence your frequency response) is very positional. Evening moving 10 feet away from your ideal listening position will change the way your bass sounds.