A wide array of selections
Apmex is a great distributor of precious metals. If I am looking for a specific coin or round, they would be my first stop to see if I can find it. Large selections and a reasonable price are some good things about Apmex. The bad though is they are not the cheapest. And if you are like me and only spend $100-$250 an order, you will find that the shipping kills any deal you come across. They do however run specials here and there for free shipping on specific items. So if you can catch the deal and the market is at a good spot to buy at, you can get a great deal from them.
I experienced shipping/processing times are about 11-13 business days in total when sending them a check immediately after an order has been placed. So not too bad.