For benefits of importers: I did self clearance in local Canada Customs office and paid only taxes without brokerage fees. I've described detailed instructions on how to self clear here:
How to self clear shipment at CBSA and avoid UPS brokerage fee
Here you may find experience of other people in comments as well:
UPS Brokerage Fees – Total Scam, Fraud, Cheating. How to avoid it
If you guys have any specific questions about self clearance of UPS packages, you may ask here, or in comments to those articles which I monitor more often.
I'm not advertising here, but sharing valuable information how to beat UPS.