i have installed two of the UEGO's in cars....and have had issues with both. one had a sensor that went out in two weeks (EVO) and the other had issues out of the controller one time. (SRT)
i like the gauge of the Greddy one the best. has the same output voltage capability also.
that and it looks pimp. AEM is digital. i like hearing people ask why my oil pressure is bouncing around