By "noticeably smoother" what do you mean? Can you explain the difference?
Do you find the VIVE Experience the same regardless of the camera being enabled/disabled? HTC has suggested that the camera option takes some bandwidth from the USB connection, potentially affecting the tracking of the headset.
It's like the difference watching a 24fps film movie, and a high frame rate digital video. Unfortunately, most digital video you see is of low production quality. If you were lucky enough to see The Hobbit in HFR, it was silky smooth. A lot of people didn't like it in cinema, but it's much better for a VR experience.
Can anyone lucky enough to have both headsets please make this a more objective claim. Play the same scene with graphic loveliness set to eleven with both headsets and tell me what's the fps for them.
Unfortunately, I don't think the FPS rate takes into account Oculus' Async Time Warp. So, while the FPS appears to be stuttering, in the headset, you won't notice. This may change when I get the CV1, as it needs more fill-rate, due to 25% more resolution and 20% higher frame rate.