I don't know about seagull, but the wait on a reload bag is at least a month if you plan to get one custom made.
They're heavy, big, stiff, but tough as hell and totally waterproof. Sometimes I'd gone with a lighter/smaller bag, but there are times it really comes in handy.
I'd suggest that you go with their catalogue since they seem to be more reasonable and you could pick up a cool design for cheaper.