Well, I've kinda put myself in a predicament......
I have a pb13, but only have like 2 days left on my trial period. It was filling in downstairs in the HT while the HT sub awaits a new amp. Anyway, I finally decided to haul the thing upstairs. I never would've expected to be anything less than thrilled with it. I'm finding it harder to integrate than the old (circa 1995) sealed 12's, even thought the SVS clearly goes much, much lower.
I've been moving it all over the room, and have had some success in that regard, it's just not the seamless blend I'm wanting.
Another factor is that I'm using the built in x-over on the SVS, so the 8" bass drivers on my mains aren't getting as much work.....a good thing when I need the headroom, but I know their absence is contributing to the integration issues.