I don't have Win 8 or 8.1, but it works very well with Win 7. Suggest that the Logitech site be contacted to see if there is a software download for Win 8 or 8.1 listed. If not, it probably is not supported.
Yes, it works just great. I use it daily on Skype. One can even turn off the lights in the room, and it still
projects the pictures.No need to purchase a better one. Sound is perfect too.I put a extension on my cord so
I can stick it out into my back yard. I'm 100 % satisfied.