Checking in to see if anyone have upgraded or built new 3Pi:s with
either the B&C 12PLB100 or Delta Pro 12A?

As @Mudshark said, the B&C availability
isn't very good. Blue Aran in the UK seem to have
2pcs coming in the middle of this month.

I´m about to pull the trigger on Delta Pros. Still a bit unsure if
these will give me a significant update compared to the 12LFA? I feel that
there's quite a bit low end output and kick missing.

I read what @Symphonimind wrote earlier.
"I have tested both Delta 12LFA and Delta Pro 12A, the latter destroyed Delta 12LFA in every single way. Delta Pro 12A can also be tuned to play exceptionally good down to 40Hz."

Any thoughts on difference in bass output between these two drivers?