for some reason though I own several linksys products I never noticed their line of voip stuff (I knew they did voip, but I was unaware of the skype phones and other things). I'm considering getting the CIT300, for myself, and possibly for other members of my family. Has anyone here used it, and how do you find it? Any issues with it? How is the call quality? Do you know what frequency it operates on? I'm assuming 2.4GHz, what about the channel? Did you find it easy to set up? The 300 and 400 are sort of vague on what might make them different, is there any major difference?