I was buried in work and didn't have time to reply.
There's a good likelihood that I'll go with this Pre-Amp.
I have a tendency to try new things though
I installed the bridge pickup in my test bass body and will install the neck pick up once I get the router template this week.
I like the idea of having a split coil option on the bridge (like on a Lakland), but I'll gauge that decision on how it sounds with the neck pu in place.
I definitely like Aguilar OBP-3, and Nordstrand 2 Band (had a Nordy). Not much of a Bart Pre fan any longer. But it'll all depend on what I hear in these pickups passive.
Thanks again for your detailed info