Great post Sparks!  I have never had a potential customer ask me about EPA verification.  They only care about the bottom line...saving money (without damaging any equipment).  The EPA is just a sales tool more than anything.  As has been mentioned before, the EPA doesn't actually do any of the testing, it's third party testing labs that do the testing and submit the results, so until the EPA receives the results, they have no idea what is or isn't being tested.  I was at the Sensors Inc. testing a couple of years ago for the Wildcat, so I know they have worked on it.  But as Sparks said, it is time consuming and not cheap.