Should'nt be any different as the block is strong, will just have to replace the turbo after 90 - 110k, i would have thought, but might last longer as the units don't run at very high pressure. My old Punto Gt needed a new turbo at 70000, but that was a 1.4 running the standard fiat 18Psi. They all go at that milage, as long as you replace the turbo before it blows, cos then the block may end up damaged.
Plus will be interesting to see if a variable serviced car will last any different to an identicle Fixed schedule serviced car. we will all be old and onto Mk5's before that happens anyway.