"It is the same, more or less..."
You sound like a clinician with little regard for the patient's quality of life. Your off-hand comment disregards the benefits to the patient to be able to schedule one's own treatment, to travel freely, and to have a somewhat normal life. The fact that I can consume relatively normal amounts of fluid and that I never have to suffer through a weekend with two days between treatments are all more than enough for me to continue with NxStage.
I will agree that once I can start doing daily slow/nocturnal treatments that I should have better labs and a better long-term outcome. For the home-hemo systems that I know about, though, the additional flexibility and ease-of-use makes NxStage well worth it.