Just purchased this pemf bed mat to test, and proof of concept. Day 1, 2 usually have some type of back pain from sitting in chairs at the wfh office over 20 years. The back pain went away overnight and is non existent, in addition to a sense of clarity in the morning. interesting, Curious to see how this works over time. I give it 4 stars, since there are higher priced mats, but for the price this is turning to be useful.