I do. I had one burned for my old 302 motor, and then re-burned for my new 331.
My 331 idles like a dream and is smooth as slik all the way up to well over 6000 rpms.
They seem to be good people. Very willing to work with you and will even re-burn the chip within 30 days I believe for free if you don't like the programs. Just make sure you have all you modifications in front of you when you call. They'll need too know just about everything that you've done from stock.
They come with 3 different programs and are a nice setup. I would really like to do the dyno tune w/wide band 02 and custom burn but they're a little to far away for that.
If you can get a custom burn w/dyno, that would be ideal and the best way to go IMO.
Good luck,
E