Yes it is a lot more work than straight turbocharging and the intake pipe work will be interesting. In my case I have to build a special controller for the supercharger bypass that I have planned (supercharger bypassed gradually once sufficient boost, vehicle speed and RPM reached).
I am doing it because I thought it would be a bit more of a challenge, it will provide a better torque curve for drag racing with the power-glide and also a bit for the wank factor.
Everyone is free to have their own opinions on twin-charging