Gordius foot controller user experiences

["Rainer Straschill" <moinsound@googlemail.com>]

I'd like to ask for user experiences with the Gordius foot
controllers, more specifically the Little Giant:

* General experience
* Button click noise: how does it range on a scale from 1 (you won't
hear it even when performing 4:33) to 10 (you'd hear it even when
performing with Motörhead)
* can it be powered via USB?

Thanks,

         Rainer