I strongly believe in "less is more" when it comes to advertising..
The biggest mistakes I see is people trying to teach or explain SFI in advertisements..
Let SFI be the teacher.. Our role as ADVERTISER ( not teamleader ) is to make people want to investigate / try out SFI..
So in short, use as little info as possible to make people curious.. Everything else is explained on your gateways or inside SFI.