Hi there. I'm a mechanic who has just fitted my first cgon ezero1 to a customers car, so yes, i am selling this product.
I won't say where i work, so i have nothing to gain from this. The the profit margins are not great anyway!
Fitted unit to a 2006 merc e220d and can report a 33% reduction in emissions as tested on MOT equipment. Cgon say this will improve as the car is driven but i can't comment on this or and fuel saving.
I can say, with confidence that less soot will mean less clogging of EGR valves, variable geometry turbos and DPFs which is enough for me to recommend this product.
That is all and i hope it helps. Please don't hate me for stating my personal findings and personal opinions.