I've also been tuned by Bren a few times. He tuned my 2008 WRX a couple times, then when I upgraded to my 2010 STi SE, tuned it at 900 miles.
My mods are too long to list, but power wise, currently I'm working with:
-Catless Invidia Q300 TBE
-Turbo XS CAI
-Ceramic coated GT Spec UEL Header/UP
-PTP Turbo blanket and SPT heatshield
When Bren re-tuned me in fall of 2011 I had just installed the header and the numbers worked out to:
I've run 2 and a half seasons of SCCNH Autocross and came in 1st place in SM for the year in 2012. It's been through plenty of hard launches (with 275 Hankook C71 slicks) and rev limiter bouncing, with no problems. Blackstone has analyzed my oil multiple times and I always check for consumption and have almost none over 3k miles.
I have recommended countless people to Bren and will never hesitate to recommend anyone to him. He's a consummate professional and usually responds to my stupid questions within a couple hours via Email. I'll be going back to him when the time comes...
He also has amazing taste in women, cars and music.