I have been using Priority Mail to ship my smaller items like coils, pinpointers, etc and twice I had a bad experience. If you are not using the "any size" fits boxes, but are using small, plain boxes to ship priority I have some advice. When you check it in at the post office, have the clerk apply priority tape to the entire box along with a priority address label. Twice my priority box got sent bulk mail. I was spitting mad that a small box that was going two states away took 8 to 9 days because of this mess-up. Both times my local post office sorted it incorrectly. I asked for a refund and they threw the "no guarantee" in my face. Lesson learned. I now make it very noticable that it is Priority Mail. Some of the clerks don't like smothering the box with this tape, but I have had no problems since. R.L.