It's really hit or miss for me. Most of the time it's totally fine, looks great, smooth, etc. It will still get that random grey bar at the bottom (I think on the member's side it shows as MFC green) every once in a while. It's pretty rare so not a big deal, but worth mentioning. I've seen it happen a few times on other models too. I do find that with the 930 I need to turn my sharpness wayyy down to avoid pixelization, but I don't think any of the other Logitechs have a sharpness setting (different than focus), so they do it automatically.
I tried to use it on the 23rd and it would only show up as a white screen, no matter what I tried. Restarting, different internet, different browser, using or not using ManyCam, everything I could think of. So I just gave up on it that day.
Today it was verrry laggy. Like 90/1500 kbps. Audio was fine. I tried all the same things and no luck. In both cases it was fine once I moved down to the middle quality setting.
Here's my stats:
Intel i7 processor
4 GB Gigabyte NVIDEA GeForce graphics card
16 GB RAM
Logitech c930e using generic Logitech software
Blue Yeti Microphone
ManyCam
70 down/30 up on wireless (it's totally stable, though, the speeds don't drop)
Chrome
Windows 8