Of the 4 RCAT RC100 switches that were being used at our field, 2 caused interference to the electronic ignition. The engines would run poorly and some servo glitching on other channels was noted. One was bad enough that the plane was almost lost. All 4 were removed, same day, and all the glitching and interference was gone. I did receive one of these that was dead on arrival. RCAT replaced it very quickly, but I am now afraid to try these inexpensive switches again. I would go optical instead. An interesting side note, I had one of these in a quarter scale Cub that was flown with a Spektrum 2.4ghz radio. No glitches what so ever. I switched this plane back to 72 mhz, to use the 2.4 in another plane, and immediately had glitching. I removed the RCAT switch and it was gone. The Spektrum masked the issue. RCAT did offer to inspect these and replace if anything was found.