If they agreed then all is good. Don't second guess now. I just started and I have 4 weeks paid vacation. I didn't charge for my sick days because I would be less stressed if I am not being paid when I call to close last minute. They prepay 2 weeks ahead. So when I do use a sick day I cut them a cheque. Seemed the easiest way. I didn't want to start moving unpaid days to the next pay period. They give post-dated cheques well in advance. Stats are paid. I also clearly noted if I close a few hours early for an appointment the day is paid, no discount. Didn't want to start counting unpaid minutes etc.
No one questioned my 4 weeks vacation. They don't get a discount if they take their own vacation but I do give 4weeks notice (or more) of my holidays so they can book the same.
It's all based on demand. If they want what you offer they will make it work.