....Do a search on here (and just about any other GTR site) on the N1 oil pump, Might change your mind.
There are fake N1 pumps on eBay, also originating from Japan, but not Genuine Nissan. For rel N1 pumps make sure you buy from an reputable supplier.
I have seen bad reviews on the N1 pumps, but they could be due to misuse. I'm sure if there was a massive problem with N1 pumps Nissan would have discontinued them a long time ago.
N1 pumps are basically the same as standard pumps. They do not allow a higher rev range, this is very important to remember. They are the same reliability as the standard pump.
If you are looking for a pump that will pump more oil, and stand up under higher rpms, I'd recommend the Jun, Tomei or HKS pumps.