The whole experience was excellent with regard to the boat (beautiful), the food and wine (much better than one would expect from a boat), the friendliness of the staff (in advance and on the night).
There were two things which could have been better - the weather which was not with CometoParis' control and more importantly there was not enough drink included in the package (the champagne was all gone within the first hour). We were able to pay extra for more but the way this worked was painful as at the end of the night they wanted me to go to a different venue in order to pay - This could have ruined the evening for me but in the end I insisted and they brought a card reader to the boat.
It was however the only drawback to the wonderful evening and I would recommend CometoParis in the future. Next time I would make sure that there was more booze booked in advance and the payment should have been made simpler.