just sent away €37.50 worth of vouchers today for a restaurant and day trips (took me two and a half hours to get everything in order). same thing with the doolin ferries, on website if order tickets online €10 discount but have to pay full whack with vouchers. Also for this trip I need tickets to the value of €45 but I can only exchange vouchers into €40 or €50 meaning I have to either waste €5 in the deal in order to get trip free or add in an extra €5 cash.
Still get loads of value out of them as I save up all year for the summer trips.
Last year I remember getting an email from Shannon Development giving me these six money off vouchers for six diff hotels. Turns out cheaper to book hotel directly, I emailed shannon dev who didnt want to know and stated these vouchers are ideal for people with no internet access (yet they were sending me the vouchers by email).
As for tesco vouchers last year I just ordered them all for same attraction (starting with R) and any attraction took them but this year couldnt do that, which is why it took me so long as i had to plan where we went, how much I needed etc.