I have a Sadowsky P/j and it sounds glorious. No phasing with both pickups engaged. In fact that attack is pointier, more pronounced.
Also like that the bridge pickup stands on it's own, volume and tonewise. Sadowsky explained how he did it, but I can't remember. I think the key is have an active bass that lets you put a little more bass into the back pickup.
I have also owned some P/Js that didn't really have this magic and the back pickup was useless on it's own. With the Sadowsky I have a legit 3 tone bass, so I am very happy with it. Owned mine 4 years now.