How your turbo wear increases with ALS depends on how much you use it. You can leave it off when not needed. When needed (hairpins etc) you can set it the way you want it, ie keep the turbo spinning at the speed you want. This will keep revs at a certain level. When you have ALS on, from inside the car it sounds like you are driving over gravel and the gravel bounces off inside the wheelarches.
A MoTeC M48 is an Australian product. It is a programmable ECU that can be programmed to generate ALS or to automize the intercooler waterspray amongst non std Evo features.