Paid almost $700CAN up front for 16 day medium car from Hertz in Glasgow. Presented with strongly recommended estimate for 1,031 GBP in insurance (for 16 days). Not knowing exactly what my coverage was through the credit card, and with two tired kids in tow after transatlantic, I declined, and took a substitute car (2 hr wait), returning it in 24 hrs and cancelled the remainder of the rental period. "Customer service" said they couldn't process a claim for a refund until after the rental period had expired. Their website also locks any ability to cancel online until rental period over. Back in Canada, I did claim a refund and was told, not possible, Hertz wouldn't give them the money back. Lots of hassle, multiple emails and phone calls. No help whatsoever. Finally got a full refund from the credit card company (no questions asked). Will never use again (nor Hertz) and recommend you don't either.