To be honest, nowadays, can't you just buy a garage door opener kit and stick any kind of remote Wifi/GSM-activated thing on it? Why do you need the intermediate server, which is just another thing to go wrong?
The key problem is that you hand off control to a third party (who, in this case, could also have a rogue insider opening doors when they shouldn't). Unfortunately, I would guess that a rather large part of the people who buy such gadgets don't realise this. For people like me, the mention of a "free account" is enough warning to avoid the product altogether.
I also wonder what your insurance will do when you have a burglary stolen and they discover you have this installed. That could make it all a lot more costly than just the initial purchase..
Biting the hand that feeds IT
