If you have a wideband air/fuel sensor, then you are safe to get a tune from Chris at AM (or one of the other trusted guys he listed). Even without it, an email tune should be all right and good enough for your purposes.
But Tom (shinerstang) also speaks from a lot of experience: he just wants to protect your car. Face it: you are changing the programming and then just running with it. A lot could happen, especially if your car is not 100% -- the new tune will find any issues rather quickly!! On a dyno, they could cut off the machine before too much damage. And if you're trying to get every last bit of performance out of the car (like Tom does), then working with the car 1st-hand is the best-case scenario.
But like I said, so long as you are upfront with Chris with all the information he needs -- then he will give you a safe, powerful tune!
He is indeed highly recommended on AFM.
FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver POWER
: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage) STYLE
: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs RIMS
: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear TIRES
: BFG KDW/2 245/40R18 front, 275/35R18 rear