I always call, mainly to request they ship USPS. If they had a shipping preference option on the website I would probably use it. My delivery times vary all over the map. I placed an order Monday of this week (over the phone) and it shipped Tuesday. I also have had it take a week to ship after order placement.
On a positive note, there are real people there taking your order, so I think if you call to place the order and tell them you are in a hurry, they might try to accommodate.