In January of 2012 I bought a Chauvet Haze 2D. The problems started with a leaky tank and regressed from there. This hazer actually spent more time in the shop getting repaired, than it was in use last year. I was amazed at their resistance to just switch out the defective unit with one that worked. Answering questions such as "Are you using the correct fluid?", was maddening.
Finally last week I just received a brand new unit that seems to be working fine. (for now) Morale of the story? Squeeky wheel gets the grease. Never ease up on those situations if you know you're right.