yeah, those are liability warnings i'd say. i've flashed mine several times, no issue. to be on the safe side, i make sure nothings on other than the dash gauge readings, since you don't have much of a chose if that's on or off. the initial reflash takes around 5 minutes since the tuner gathers and stores your vehicle's info, and saves the stock file. then, it flashes the ecu. any subsequent reflashes take approximately 3 minutes though.
2006 Mustang GT: 5-speed
Show: Hood scoop // Side Scoops // Louvers // GT500 Spoiler // Rear diffuser insert // Stripes // Mustang trunk letters // Interior goodies.
Go: JLT intake // J&M LCA's // J&M UCA // Strut tower brace // FRPP Front Lower Control Arm Brace // Pro 5.0 Shifter with MGW blue striped shift ball.
Flow: Flowmaster American Thunders.
Stereo: Pioneer DEH 2200ub.
Oh and of course, the lead foot mod