I have not tried the BPB, but if the buffer is similar to the one in the Ruby Red, then it is of high quality. My Ruby Red is at the end of my board with the buffer always on cause it recuperates the highs that i loose in my long chain.
I would also love if my SBEQ had a buffer, as i would free some space and take the Ruby Red out of my board. Don’t get me wrong, i love the Ruby Red, as an od, boost and treble booster. However, i find myself using it mainly for the buffer and as a slight booster.
I was wondering if it would be possible to install a B-Buff in my SBEQ. And if so, would this change the tone of my SBEQ? Has anybody tried this? The B-Buff is a buffer with a boost trim pot made by Barber Electronics. They claim it can be installed in almost any pedal and it goes in the place of the battery. You can check more out here
http://www.barberelectronics.com/B-Buff.html