I have an unusually wide IPD (about 73mm), and I struggled with this on the DK2. The image would not focus properly because the alignment of the lenses. I was able to address this fairly easily with a 3D printed set of adjusters.

The consumer rift, however, has a IPD adjustment knob on it for exactly this reason. In playing with the prototypes they had at PAX last August, the IPD was much, much less of an issue.