Me and a buddy both bought Dive Rite 21 watt slimlines at about the same time. We both love them but his quit on his last dive(I hope this isn't a sign of things to come for me). Dive Rite is going to fix it and get it right back (at least that is what they have said) to him. I love the adjustable beam but the test tube being exposed seems vulnerable to breakage. I dove it side by side with a light cannon and there is no comparison. For the money I felt like it was a better deal than some of the other HID's out there. Just thought I would let you know my experience.
Gillty
Gillty