Nice to see Memtest86+ being maintained.
I use it on random machines as one of the burn-in tests of hardware. Not only of RAM, but it also lightly exercises CPU, and helps test cooling.
Early on, I used it on a bootable CD-ROM. In recent years, I've been putting it in the Grub boot menu (on systems not afflicted with UEFI).
From someone who ships software that runs on hundreds of millions of computers: please consider running a memory tester once in a while, particularly if you have any unexplained crashes. The days of being able to assume "it's not the hardware, stupid" are past. Bit flips can and do happen. We've made everything small, fast, and cheap. Those are great attributes, but they come with a cost: we've also made things hot and unstable and removed all the safety margins that were in the way.