I used to use a PF. Nice sound, colours up the bass in a nice way. I wouldn't say it's totally transparent, it's got it's own sound, but a nice sound I must add. Build quality lets it down as the switches and input jacks are doomed to fail over long haul use. (they're all PCB mounted) It's got a DI built in so that's semi useful.
The EBS is pretty darn transparent, solid,versatile in that it has several modes (tube/normal/dual) and you can also add gain to the signal beefing things up somewhat.
They're both nice sounding units IMO. For the extra cash you get the full transparency of the EBS with little to no colouration. It tightens things up in the low end nicely.