I know people who are happy with BAMACHIPS and I am happy with BRENSPEED.
I went with BRENSPEED for my C&L Racer kit and SCT Xcal2 because Brent offered a better price. Brent and his crew are easy to work with in my limited experience so far. I am new to this tuning stuff so I had to call for some instructions for the user modifiable options on the SCT Xcal2. They were more than willing to walk me through a few things and offered to send me a modified tune to match the user modifications I was attempting (idle speed, top speed, rev limiter, etc.).
I don't think you can go wrong either way you go.
2006 Legend Lime Mustang GT/Manual Trans
/some mods(tired of updating) 13.257 @ 109.36 on stock 18 fanblades and stock BGFs wth CAI, tune, UDPs
1967 Lime Gold Galaxie 500 XL/390 4bbl/Toploader
1966 Mustang Coupe/bare metal (rebuild in process-slowly)/engine&trans