They are a two way, not one way. I used to have a Nismo 1 way and it was very obnoxious. You do get used to it and you learn to drive around it a bit but everyone does look at you funny, which I quite enjoyed. Still, some days, maybe I was a bit tired or cranky, it would annoy me a lot. Now I have a full GTR rear end and it's much nicer on the street. The lock up on the track isn't as good but overall I would say that it's a better compromise for a street car.
To do this you need the diff centre, housing, half shafts, drive shafts and hubs from an R32 GTR. It all bolts up. I got the lot with rear subframe for $700 from a mate. SSS wanted $1200 so somewhere in between there is your window.
That said, I agree that you should get someone who has a 1.5 way or 1 way to take you for a little drive so you can see what it's like. Any old SAU type event should do or post up where you are and maybe someone from here lives nearby.