I've had the Gunsons one since sometime last century, but hadn't used it for such a long time I couldn't find it. When I can't find a tool, I usually buy the cheapest one I can find on eBay (which in this case looks identical to the first set from your link), as this usually results in my original misplaced tools coming out of hiding and being found before the eBay one is delivered. But this didn't happen and I had to use the eBay one.
It appears to work fine, but it's definitely not a quality tool and I'd not expect it to be highly accurate.
It should be fine if all you want to do is check cylinders against each other to see if one gives a low compression reading, but if you want an accurate measurement to compare to the manufacturers specifications, then you might be better off with something a bit more trustworthy.
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