I haven't had a ton of stuff done by Brad, but everything he's done for me turned out excellent. Unattended mastering sessions can be nail biters, but Brad seems to know where you want to go without you being there.
One of the bigger pitfalls I run into with people mastering my mixes is ME's aggressively rolling off low end sub's to cheat a couple milli-db of loudness into the project. I had no problems at all with my low end from Euphonic. He also added a 'pure' sounding coloration (subtle even ordered harmonic distortion?) to one of my tracks that stuck out a bit (2 track'ed instrument with rap on top of it) that really enhanced the track and made it fit in with the rest. He also maintained my imaging which is a big deal to me.
I also love the Euphonic t-shirts...
