I have yet to try one of these.
Has anyone given this a whirl??

(The following is his email)
"The Wild Divine" is a biofeedback-controlled video experience of the best quality. The graphics are stunning and complex. The player has two GSR and a pulse-rate sensor (plus heart rate variability) to navigate through a surreal Myst-like world. Fans of Tolkien and other fantasy-world-building authors as well as users of the popular Myst series would tend to enjoy this, and folks who grew up on the West Coast. A very good way to involve teenagers with biofeedback, I would guess.

I would strongly encourage you to consider it closely from the perspective of market strategy and execution. It's $129: www.wilddivine.com/

(end of email)
Would love to hear about it, if you have any experiences with this device, let me know!.... Brock