ABSOLUTELY NOTHING!
I'm just saying as someone who has shipped in the past and received my share of shipments....
That if I plan on buying from someone who isn't well known, I would prefer them to be Fedex Certified.
That doesn't mean they have to use Fedex to ship it out, they can use SYR if they want.
It just makes me feel good about the shipment knowing that they know what their doing and have gone through Fedex's Package Testing and Development process to prove it.
You can probably get Certified by the time your needing/wanting to ship out babies if you care to go through the process. It doesn't take that long.