I'm looking to test-drive a hasselblad 500cm (or perhaps a 503cm which would be more current) before i get sucked into the hassie disease.

have anyone had any experience with the following?
http://www.headshotsrentals.com/Rentals.aspx
http://www.vistek.ca

or do you have another suggestion where I can rent one around the GTA?
(Currently i'm still torn between a hasselblad 500cm and a mamiya c330) So i'm looking for test-drives