This is interesting to read from north of the border. I always thought FedEx had a better reputation, but I see a lot less of them driving around here, where it's primarily the post office (Canada Post) or UPS. We also have Purolator, a Canadian courier company. Up here UPS has a bad rep for gouging cross border shipments with brokerage fees (if the recipient isn't aware of the difference between Standard and Express shipments). In any case, both UPS and FedEx seem to like all sorts of add-on fees for clearing shipments, whereas Canada Post is the most straightforward. Where I live, Canada Post and Purolator will probably deliver before noon. It's one of the reasons I like B&H's ground shipping option to Canada via Purolator. I'm lucky if UPS does so before 3pm. I've liked FedEx for the ability to have them hold a package at the depot for me to pick up if I won't be home. UPS seems a greater hassle in this regard. Anyway, to keep this somewhat relevant, whenever I buy gear from individuals in the US, I strongly prefer they use USPS. I've never had a problem with any of those shipments.
My last UPS cross-border experience was with Paul C Buff (AlienBees, Einstein strobes, etc.). I sent back a couple units for repair by post, but they only ship UPS (I've pleaded with them to consider alternatives). When I received the UPS waybill number from them, I called UPS to check on the details and possibly prepay taxes on the cost of the repair. They hadn't gotten everything input at that point and couldn't take payment, but confirmed some details. When I received the shipment, the driver handed me the bill for about $350 in taxes. It should have been about $15. I was floored. UPS interpreted the repair bill for two units somehow as importation of four units. I paid it to take possession (the driver suggested refusing delivery for one day to clear things up). When I called UPS, the CSR suggested the easiest way to resolve the problem was to file a claim with the Canadian government agency responsible for imports. Having in the past waited several months for a UPS refund, I took her advice (skeptically at first) and it worked out, fortunately. Others up here have accused UPS of intentionally overcharging for the collection of taxes and duties and this experience has got me wondering...
It's funny, many in Canada like to disparage mail carriers (and teachers) because of their seemingly cushy union jobs, but I sure hope Canada Post and USPS survive and continue offering a great alternative to the private courier companies.