Amazon.com.au:Customer reviews: Newkiton Wheel Marking Gauge Plus with Micro Adjust Function, 1 Bearing Wheel Cutter for Soft Wood, 1 Locked Wheel Cutter for Hard Wood, 1 Metal Making Pen, 10 Marking Pencils, 1 Screwdriver Included
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In all, I think this is a reasonable unit for the price. However, there is one issue in particular that detracts from its accuracy. Specifically, the rolling wheel cutter's fixing screw sits slightly proud of the cutter, and therefore depending on how you use the gauge, your mark may end up slightly the wrong position. For example, if you drop the gauge cutter from your piece to a bench (to get the width of a piece you're marking for), the measure the cutter lays will actually be ~0.5mm short of the required measure. It's not a huge amount, but it will make a difference for finer work. I'll note that the stationary cutting wheel does not have this issue, as its fixing screw sits recessed within it (and therefore the cutter edge gives the true measure).
Also, the blade doesn't seem particularly sharp, but I don't have experience with other gauges to say whether this is about normal or not.
As yet I have not given the gauge a thorough run but my first impression is that this is a quality instrument at a reasonable price, with multiple features. Sorry I can not be more specific at this time.