I just bought a corabination tens unit with ems capability as well. I was wondering if people use theirs all or most of the day or for just a brief session per day? Also, I know that for nerve pain, I am to use the tens setting, but I was wondering if folks use the EMS setting for muscle spasms? Also, any feedback on how well the unit works for you? I have SI joint and lurabar problems. Have had 3 RFA's. Two to the SI and the last one to L3, L4 & L5-S1. Thanks for any information.