The nightly videos start out objective and practice-focused, but by the middle of the course Goenka suggests quantum-scariness explanations for the sensations meditators are feeling.
As one retreat participant noted, in one of the nightly video talks [0]:
> [Goenka] mixes quantum mechanics with "psychology of enlightenment"
What makes it a bit more of a breach of trust is that by the time he breaks out the full-on woo-woo, you're deep in the process—the days are flying by—you purposely don't have your critical thought facilities active.
Aside from that sour note, I'd still suggest this course to others. Hitting a stride with practice and tuning your ability to focus your attention on minute sensations is a fascinating experience, especially if you've taken any courses on proprioception, sensation and perception.
If you're a rationalist who already firmly rejects the ideas of mind-body separation and reincarnation then you have nothing to worry about.
[0]: http://www.vipassanaforum.net/forum/index.php?topic=1871.0