Hey Bill, I'm also interested on more information about Kevin 8 efficiency.
I'm a new user, but I had read threads here at forums for while, just wanted to get my registration so I can make sure to follow up on this question. Hopefully someone who had truly experienced Kevin 8 will show up to give us some insights.
At first, I've found this user's review page which seem not so good, but I'm not sure if it's regards this product "kevin 8" or other product lines; http://www.thebaldone.com/reports/kevis.htm
Thanks