we had one in May for our 10th wedding anniversary. For us it was handy but only because we had our 9mth old baby with us and he was able to take a cool 2 hour nap and we could take in turns playing in the water with our other 4 year old son.
DH also bought a pair of sunglasses (which he had planned on buying anyway) and was able to use the 25% merchandise discount, so it offset some of the expense.
I would say it was nice for a special occassion but probably wasn't worth the money if I'm honest - plus we much prefer Blizzard Beach so probably won't go to Aquatica again.
Sorry if this sounds negative - it was nice, but not great thats all!!