I've seen them too. What I think they leave out is how complex it might be and all the laws (that vary by state) that you need to understand. I do believe it's real though - you just need to know how to do it. I'm just getting started with my research now so I'd thought I'd ask here too given the gazillions of well informed members we have...

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'08 335i Coupe - Barbera Red / Saddle Leather / Light Poplar Wood / 6spd Manual
Options: Sport, Premium, Cold Weather, Comfort Access, Active Steering (awesome!), Power Rear Shade, IPod Adapter, Navigation w/IDrive
Mods: M6 Wheels, Split Armrest, M-Steering Wheel, Euro Light Switch w/Rear Fog Lights, Short Shift Knob w/Matching E-Brake Handle, Clear Reflectors, CDV, Clear Bra

Retired:'04 X5 4.4i