Like dan said it really depends on what else.
If it has all stock components (clutch, flywheel, turbo) with just the megasquirt it is not worth it ( in my opinion).
If it has some headwork, a lightweight flywheel, upgraded clutch, Ported intake that has been shaved, ported turbo manifold, new turbo, bigger injectors etc... then it is worth it.
So get a detailed list of everything that comes with the swap and then we can tell you if it's worth it or not.