I have a Sartek 10 watt focusable head that I have had for almost 2 years without any issues. This included beating the dodo out of it during all of the cave classes with lights out, air share spontaneous drills. I lost the rubber cover for the head due to not having time to stow it away while going through cornflakes when the instuctor induced failure occurred with the simultaneous out of air diver needing help. The only problem I have had with the switch is that it seemed all too easy for the instructor to get to it! I have heard that their service is great and that is one of the reason I bought one but thankfully I have not had to find out yet. Hoodlum