I usually go to the Better Business Bureau first thing when dealing with a new company and check them out. In this case, Fertigator is rated an "F" by the BBB. I've never used them so I can't say anything other than to pass on the BBB rating. You can check any company yourself by going to:
http://centralflorida.bbb.org/Find-Business-Reviews/
and typing in the business name and state (you don't need to type any more than that, it will work).