Don't forget, this can be used with systems that have an internal switching BEC, like the MMM, MMPro, EZRun, etc...
All switching BECs on the market today have the same basic togology; the input is in series with the switching FET and bucking inductor. A failure of the switching oscillator or the FET will cause full battery outout to appear at the output. So, they are all prone to the same potential failure.