A reality check here
Now my individual experience two weeks ago is obviously anecdotal, but, mine was a shocking experience of Groupon, which made them look seriously incompetent, to me.
Having paid for two Odeon vouchers ("cinema tickets for £6") from them, which, the offer's terms claimed, would be emailed within two working days of placing the order (see bottom*), they still hadn't arrived come the time they were needed, despite it being more than two working days.
Additionally, I had initially been issued with a receipt for only one, despite two payments being taken from my account; I had had to write initially and confirm two were due; and after the weekend came and went and still no tickets, they didn't believe I hadn't received or used it. It finally arrived after they agreed a refund, something I am still waiting for some time later.
*"After you click 'Submit order' and purchase your Groupon, the voucher will be redeemed instantly by Groupon Shop Limited. Since the Groupon is redeemed instantly, you will not receive the standard Groupon voucher the next day. Instead, Groupon Shop Limited will email you within 2 working days with your own voucher for admission to ODEON."