Your roll will be given a bit more individual attention than say a large company such as Qualex who will be processing your roll among perhaps 50,000 other rolls on a given night. In case you wondered, a one-hour lab does not take shortcuts in the processing method. The film you send out of town spends more time on the road than in the lab. Mail order offers deep discounts by eliminating the middle man and the convenience of having your photos returned directly to your home. I often question whether they are truly low when you add the postage and handling fees.
Turnaround is slow by comparison.
I have my personal reservations with dealing mail order. Film does occasionally get lost by a lab. When you have your order mailed, you increase the chances that something can happen to it. And should you have a problem with an order, the correction becomes more involved than if you used a local outlet. The choice is normally decided by four factors price, convenience, quality and service.