I haven't used a TENS - but chiro uses IF stim and I use an EMS stim at home - I have mild muscle aches and pains
chiro uses low level laser also

some links about them-

Electrotherapy
http://www.vitality-web.com/backstor...Stimulator.htm
http://www.medi-stim.com/overview.htm
http://www.rehabpub.com/features/82004/3.asp
http://www.spine-health.com/topics/c...ctro/el01.html
http://www.skylarkdevice.com/web-site/ele_thera.htm
http://www.bmls.com/electrodes/epc.php
http://rehabilicare.com/protocol.html

Laser/ Infared/ far infrared
http://laser.nu/
http://www.purehealthsystems.com/infrared.html
http://www.purehealthsystems.com/mus...in-relief.html
http://www.toolsforwellness.com/far-infrared.html