I have been going round and round with DirecTV for a couple of years now over my signal strength and constant loss of signal in my setup. During fair weather, my signals are almost all above 90 and most are 100 so according to DirecTV, there isn't a problem. However, I tend to lose signal during the slightest of rain showers and minimal wet snow falls which gets frustrating at times, especially in the winter. The "company line" quoted by many that only the heaviest of storms or snow will knock out your signal is just not the case in our household. If I didn't love my setup so much, I would have left long ago. I even installed a roof antenna this year simply to ensure I could get my local channels during weather warnings because the reliability of my dish signal is so "flaky".
So after years of climbing on the roof with a broom to brush off a minimal amount of snow that is sticking to the dish, or breaking out the super soaker filled with hot water from the hot tub to clear ice buildup, I finally broke down and bought a heater about a month ago and couldn't wait to test it out to really see if it would help.
We unexpectedly got a little freezing rain that changed over to light, wet snow a few weeks back so I had not turned on the dish heater. Ice accumulation was minimal and snow accumulation was less than an inch! However, that was enough to knock out my signal. Checking the dish, the bottom half of my dish was covered in snow where the top was visible but had a little ice buildup on it. One wouldn't think that would be enough to knock out my picture, but it was for me. Before taking action to restore my signal and out of curiosity, I checked my signal levels and saw that they had dropped well below 70 for almost all transponders with quite a few at zero! I flipped the switch on my heater and within 10-15 minutes, the snow was all but gone, dripping off the bottom of the dish and my signal was back and signal levels were back to normal.
So I don't need 1-2 ft. of snow to lose signal to tell me if they work or not. For me, it kept me from climbing up on the roof with a broom or breaking out the super soaker in my jammies at 2 am for the smallest amount of snow covering my dish. I now expect a ladder/broom/super soaker free winter for the first time in many years!
I am happy for those that don't feel the need, but for some of us, it is worth it.