very usefull when you want to keep an eye on your rig while away from it, you can even restart it, overclock, undervolt, check temps, and musch more while using the free edition. Honestly, i couldn't ask of anything more (except for a few things, but they are covered by the paid version)

Minerstat, especially with their OS helped me manage my rigs easier and remotely. The paid version with alarms, triggers and Telegram bot is worth the price! Come on, if you're mining it pays itself, since it saves you from errors and downtime.

The overall usability of Minerstat is just super simple and effective. I love the benchmark tool although there is improvements that can be easily done to make it even better. The Windows app and the bootable Linux app works like a charm too.