Innovates also seem to be around 0.3 out but I quite like the features some of the kits have and add ons you can get for the innovate equipment. They also seem to have the most stable readout in terms of sensible refresh rate giving an easy to read average reading.

I guess if I had to choose a basic 52mm gauge, value for money the AEM seems really good! They have a lovely clear screen, the sampling rate seems sensible for a fairly stable readout, so not a bad purchase for the money!