Marcos,
I'd say I've become rather an expert at 'gar shipments over the past 8 months, lol.
I've tested the shipping in what can be said are the harshest conditions. I think over all it depends who you order from, but for the most part mail orders are shipping very well.
I've done many orders and recieved many bombs out here in Iraq, and everything has always arrived in perfect condition. The 7-12 days shipping along with the extreme heat can cause issues, so I never smoke anything unless it's been in the humi after shipping for at least a week or more.
But overall, I'd say most online retailers are good about how they package them. A lot even send them with a water pillow or humidipack.
I figure if I can get a shipment out here flawless after 10 days of transportation, then 2-3 days in the states should be pretty easy.