I'd recommend them all day long, while not the most cutting edge custom maps they have written a faultless map for my engine, not a single problem. Yeah, their figures are a little optimistic but a few people have proved its only a 5% overshoot.
They're better to use than R-Tech if you're local as if you do get issues or need something tweeked then its a short trip rather than a 90 minute drive (not disputing R-Tech's reputation before anyone gets angry!). I live near AmD too so will keep an eye out for you.