Although not nearly as fast-paced and cinematic, the kinda-badly-written Permutation City by Greg Egan does a much more thorough job of exploring uploading and simulation, imho.

Morgan is a wee bit oversimplifying certain aspects, in particular the tech is almost too nicely packaged and very "physical". Which is certainly a possibility, but Permutation City crosses the speculation with the distributed computing trends we are currently experiencing.