I'll try to make some test cuts in the next few days and we'll see how accurate these saws are after a couple of decades of use. I doubt I've made a million cuts with it, but some good number of thousands. I'll post pictures of the results.
Here's a picture of a setup a good while back. It and a radial arm saw were setup in a 40 foot long hallway in an old house. Just by luck the portable base I bought for the miter saw ended up being exactly the same height as my made in 1974 radial arm saw base that I made the day I took the saw out of the box then.
I was thinking the board was a 2x12, but not sure looking at the picture. It's from my stash of treated lumber that is kept drying for years waiting for something to be made from it. It was cut with a pull cut, because those are the only cuts I made with it. I'm thinking this was from 2009. Most of that air dried treated lumber has a lot of stress in it, so I may need to back out of the cut several times and start over as the cut is made.