I received your SMS switch just over a week ago, and I am completely satisfied. I am using it to control the pre-heater on my plane, and initially tried it out in 5 locations:
-my home
-a tie down at the nearby airfield on Cape Cod, MA
-inside a metal hangar, doors closed, same location
-inside a metal hangar in Plymouth, MA
-inside a metal hangar in Marshfield, MA
It has worked flawlessly in all 4 locations. It is simple to setup and easy to use. One of my pilot friends in one of these location has already received one, and 2 others who have observed it's operation plan to purchase as well. Last year I had tried and returned the GSM switch from Amazon which basically is not functional on today's cellular networks. Thanks for a great product!
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