I work in a business where reading a Mic to .0001" isn't a luxury, it is a requirement. A guy that is good can tell me within 30 millionths of an inch what size something is, personally I am tapped out at about 60 millionths of an inch with certainty. 99 out of 100 people don't know how to use a Mic, so the added accuracy it might provide is useless. 7 out of 10 people can use a dial or digital caliper though and get within a thousandth of an inch, so it makes good sense for the average user. A thousandth of an inch is easily within any reloading specification for all but the most harcore benchresters out there. Spend as much as you can, you will get a better product.
For reloading I use digital calipers for 99.9% of what I do. I use Mitutoyo, and they are worth every cent that they cost over less costly tools. The batteriy in mine is just now alarming, it is 9 years old with 7 years of commercial use on it, and literally hundreds of times they have been left on overnight or longer. Oh, they tell you there is a battery alarm and still give good readings, they don't just start giving bad readings until you figure out what the problem is like most of the cheap ones do.
My every day world is one where ten thousands of an inch really matter and I am dead set on using good tools where accuracy is a concern.