I hope they are better then their head space gauges, or anvil bases. Have several, and none measure the same. I keep one on my bench, and another in my box that i take to the range. With several i have, the closest one i could find is .018 difference. They need to work on the tolerences of their measuring tools. DJB
That's because they are comparators and not direct reading tools. Not to be rude but honestly, it's obvious that all of these complaints are being made by people that clearly have no idea of how the tools are used or any real concept of the kind of accuracy that they were designed to measure with. These are tools for the average hand loader, they are not lab quality precision instruments used by a quality control expert. Measurements that are plus or minus .001" is usually just fine for the average user so as far as I can see this tool will fit that requirement very well and it will fit the budget of most hand loaders very well.
Like others have said, I've picked up or made tools that will do the same things as this will so I have no need to buy it but if I were just starting out it would be a convenient way to have several tools in one device that would reduce the clutter on my bench.