i have had both the 2j1 and the 2j2, the 2j2 was on an evo for 2 years before i sold the car, i can only assume its still in there, the 2j1 is in its 3rd car and has just needed the sensor replaced a couple of times, but a new sensor is only $100.
it does your narrow band simulated output too, i was using it in my skyline as well as the wideband feed into the ecu.
http://wbo2.com/2j/default.htm