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)

good service, i have used Minerstat for about 11 months now. so far i haven´t run into any issues

Great software and service for peace of mind. A broad offering covering all your needs.
Courteous and knowledgable help when you need it and a friendly user community that pitches in.
Easy setup for beginners and flexible for more advanced users.