its a neat little toy, that you can transfer between vehicles, but there's some important info it doesn't monitor/show. like injector duty cycle and maf voltage, for instance
For Nissans, I think that using ECUTalk is a much better tool, is more accurate and if you have a PDA or other windows mobile device, it's much, much cheaper.
ECU Talk is great if you want quick info, but if you wanted little more advanced features and log analyzing ability, Nissan Data Scan is the way to go.