I bought both the Myco MZ-600 and the AWS-600 and can state that they are identical products. The only difference was the colour of the case (silver for the Myco and black for the AWS), the brand name and the paperwork it comes with. The scale itself is identical. Oddly, the AWS has a 10 year warranty and the Myco has a 3 year warranty.
I tested these side by side and found no difference. A 500g known weight is required to calibrate. I tested the two of them with weights from 1g to 100g. The 1g weight registered perfectly on both in the centre of the weighing platform, but had some variation when the weight was moved to the outer edges - a +/- variation of 0.1g was observed on both scales.
In normal use, I found a couple of quirks to be aware of - when weighing small quantities (in my case essential oils in amounts between 1 and 10g) it can take a few seconds for the scale to settle down - often it will not register a few drops added to the amount being weighed for 2-3 seconds. So it pays to pause, especially when you are close to your target weight. The second thing that it did was unexpectedly turn itself off when I was in process of slowly weighing several oils totalling 10g - taring as I went, so I lost the combined weight when it switched off. Not sure why it did that, but I'd recommend writing down interim weights before taring if you are using it in that fashion.
Overall a good balance for the price; beats paying 10x what this costs for a lab-quality one if you don't need it.