I am on day 3 of using the nayoya back pain therapy mat and so far so good. I like how portable and light the mat is, it feels liek it weighs almost nothing. Day 1 i layed on it for 15 minutes, day 2 I did 25 minutes and this morning I did a 30 minute session. I might do another 30 minute session tonight depending on how I feel but so far the pain in my lower back has eased alot and I feel more relaxed overall. Ill report at the end of the week how my treatments going.