Which wideband controller

[Lesliehedley]

I've got an Emerald ECU in my 400SE and I would like to fit a wideband controller and O2 sensor to do some adjustments to the AFR. Until recently I was thinking of getting a Techedge 2J2 but I've been reading about the PLX SM-AFR and it looks like a reasonable piece of kit and is substantially cheaper than the Techedge. Does anyone have experience of either unit re: reliability, ease of use etc. TIA.