Germ Guardian does NOT reach the temperature needed to sterilize. It's a 'dry' heat that needs to be sustained longer than it does to sufficiently kill germs, esp if stuff goes in wet. Avent reaches 212* and uses steam, a proven sterilization method.
Re. the youtube link: I recommend everyone watch it, whether you use the Altera or not. HOORAY!!! We finally got some input from the CFF from these bottle sterilizers! <img src="i/expressions/face-icon-small-happy.gif" border="0"> This really makes me happy... plug in (NOT microwave) bottle sterilizers like the Nuk (that is the one demonstrated) are what is recommended. Fortunately, it wasn't worded in a way excluding anything but Nuk- Avent is good too. <img src="i/expressions/face-icon-small-smile.gif" border="0">
I am so glad to see that they have finally spoken on this!