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No idea what they are like but for what they cost you can get an innovate or aem wideband which are well proven.
I used a innovate on my car and couldn't fault it, had a nicer display than the one you linked too.
It just looks old fashioned imo, similar to the display on the old knocklinks. I prefer the gauge type like the innovate that gives you an actual number.
I'd rather pay £150 for an innovate than £70 for the one linked but that's just me.