The mechanical life is going to determine just how long the device is going to be able to last. One of the reasons that these are popular is because they can last for so long. With the regular microswitches, you will find that they can last for a million cycles, as mentioned, and the high quality ones could last for ten million cycles. For devices that will not be activated very often, one of the regular switches might be fine. However, those devices and switches that are going to be in heavy use will likely want to use one of the heavy-duty actuators that is going to be able to have a longer life.