They say the EB torque curve is smoother than the v8 engines of today. It kicks in right at 1800rpm, and stays constant to about 5000rpm. And as far as longevity of turbos, if built right, i wouldn't worry about it at all. many semi trucks are truboed, and those last damn near forever (yes, i know, diesel vs. gas). It just comes down to how well its built, and how it all comes out in real world. Can only guess/speculate/make up crap until then.
Either way, I would not buy the first year or two out the gate, lets see how it performs and holds up first IMO.