Doyle's personal guitars at NAMM had the Barbera w/Baggs onboard pre...the Barbera's are easily recognized on sight.
My either or comment referred to staying fully external...least expensive, keeping guitar mostly original, or going with a custom internal.
The OP was interested in solving the string balance issue inherent with UST's...Barbera does that well and designs them custom for each instrument.
I think we're in agreement on that fact.
Definitely agree. I'm not a fan of the "barn door" preamp either, but it wasn't an option on the DD.