Been looking to get one for a while. I've been trying to get an Eagle Industries one in CB but they are rare as hell. The Pantac is a really good solution. It is a VERY versatile vest and it even has its own backpack made especially for it as well as a back plate to make it more of a plate carrier.
If you go to Airsoft Smith they have just about EVERYTHING Pantac (ASGI is starting to get more and more but they are lacking some of the pouches, backpacks and back plates that Airsoft Smith has.
Shipping is free over $125 and they ship out of Ohio so even if you don't hit the $125 mark, it still won't be as bad as paying cross country shipping from ASGI or World Wide shipping from Red Wolf (the only other retailer besides ASGI that sells Pantac in the US that I know of).
Link:
http://www.airsoftsmith.comAlso, Here's a video of a guy with the vest plus back pack and then a guy with the vest plus back plate and backpack: