It is easy to put together and monitor the heat and time. And, it relieves soreness and pain.I noticed I felt less pain less tension the more I used it.My gifting in one unit, they use it every night, too.The healing power is truly felt with continued use, over time.Just be careful how hot it gets. It can burn you. It is not a toy. Set the temperature to a lower level, and lay on it or lay it on your body for however long.I move mine around to neck, shoulders, front of chest, lower back calves, belly and love it. It has a cover, so doesn't feel scratchy.