UPS destroyed an amp I had sent to the manufacturer for repair. The manufacturer handled everything, so I don’t know how it was settled, but the 64 lb. amp was not double boxed. The amp was obviously dropped at some point. When I sent it in, I had UPS Store box it up. They used a box way too large for it, with air-filled plastic packaging. I was not happy. It cost me over $140 to pack, ship (ground) and insure the amp. Also, I have heard that UPS stores can charge whatever they want for "insurance". There is no set price scale from UPS that they must follow.
In contrast, I just got a subwoofer delivered by FedEx. 80+ lbs. in the box. Two FedEx delivery guys brought it to my door and into the house. The box was in perfect shape. I think I will be sticking with FedEx from now on, even if I have to box things myself. In my area, Walgreens drugstores will accept FedEx packages for shipping. Very convenient.