I'm very happy with the service. Had no problems with the tickets, didn't have to print them out, e-mail tickets worked just fine. Got into Louvre on Sunday 11am entry with just 15 minute que through security check. We had to wait bit longer for the evening cruise (Sunday 8pm) around 45 minutes before departure, so loads of people there, but it seems thay all got on cruise within 1h. The was an option of a audio guide in my language (polish), so that was a huge plus. I booked tickets three days in advance and got tickets the day before my activities, I would recommend this way of visiting places, it was stress free and totally worth it.