I upgraded mine. I will give you the good with the bad.
Good:
Warranty starts over.
A better amp.
I like how the driver and port are switched in the location. I did notice some port noise from my PB-NSD when turned way up. None with the PB2000.
Bad:
$230
The PB2000 has a little light on the front that is a little bit distracting to me. I fixed mine with some black electrical tape. I just used a hole punch to cut out a round circle to place over it. I can still see the faint light glowing from behind the tape. Not through it but behind, if that makes sense.
I will add that while I had both subs, I had a chance to hook both of them up in my room. Boy was I amazed at the difference two subs made. It seemed as if every seat in the room was the sweet spot. Two subs really are better than one.