I've heard of it...
It's a good cleaner..In fact, I strongly considered adding a similar bilge cleaner to my own company's product line 5 years before they ever existed..till I found out that citrus oil dissolves light plastics (like hatch covers). I was afraid to risk damage claims from boat owners who "don' need no steeeenkin' directions" so we passed on it. So be careful with it...and remember, no matter how good the cleaner is, you still have to flush all the dirty water out of the bilge unless you want to go through a gallon of the cleaner a month.