Works great! The A-MAZE-N tubes or trays are my only source of smoke in my home built electric smokers. For brisket and butt smokes, I run at 225-250 and use the tubes most of the time. I place them below my heat source and have no problems at all. For sausage and other low temp smokes (120-180), I use the trays or tubes at or above the heat source.
Also, to give an idea of how well they work, my big electric vertical is 24"x24"x 70". It's a large space and I get a great smoke flavor and color.
All of the below were smoked with an A-MAZE-N tube.