I'll just throw in that I am one of the Kickstarter backers. We received an email the other day that the original fullfillment date is moving from April/May timeframe to the end of the year due to various challenges in development. While it's not totally unusual for a Kickstarter fullfillment to delayed, it is bothershome that it's moved that much, already. It's the longest delay I've personally been involved with in my, admittedly, limited pledging activity over the last two years.
I'm not sure I agree with the comments on poor water pressure. If you look at the videos, they look like they get very well soaked, quickly, while trying it out. It appears to me that it would be as effective as a high pressure showerhead for the basic principles of showering. If you were referring to the massaging capabilities of a high pressure shower head, then that I understand. Personally that is not something I use the shower for.