It will take a while before mine will be used as i'm building an engine at the moment for the car and it will be used with this new engine.
the sensor will die quicker if you are running highish EGTS and you have them mounted that close to the turbo.
I originally set up a group buy for the AEM unit but instead i offered the innovate unit because;
The AEM unit is not calibratable, so as the sensor wears the accuracy will begin to vary, they are calibrated from the factory with a resistor and then they are fixed. With the innovate unit you can do a free air calibration at any time.
You can't change the AFR scale, so if you swap to E85 or some other fuel your only option is to flip the gauge face to the lambda scale. Where as with the innovate unit you can change the scale to a number of fuels.
The Data logging on the AEM unit didn't impress me as it's just a word pad file with a series of AFR's with no other reference (this won't matter if you are data logging through the ECU though as at least then you will have a RPM reference)
The reviews i read said that the innovate unit was one of the most responsive units available, but that has been brought into question in this thread.