We have had them for 5-6 years now. The 1st year is the expensive one, unless you can get a 2 years for 1 deal(thats how we started) after the 1st year its $110(went up last year from $100) to renew.
You need to look at what alternative you have. Are you saying 2 days Xmas and 3 days August? So I guess cheapest tix would be:
Xmas, 2park 2 day ticket $95
August, 7 day unlimited $100
Total $195 + 5 days parking fees
AP is $230 which is more or less same price but you then have option to come and go as much as you want both your hols with free parking. You then have option to renew for $110 if you go the following year.
Hopefully they will have an offer before Xmas, either a discount or 2 for 1, then they are very much worth getting. Also not taken into account any room discounts.
All prices are + tax.