The script has not been optimised for speed, with loading times sometimes taking several seconds.
A couple of times GTmetrix could not even do a test of the website for me because it timed out!
The script supports a dozen billing systems, including Pay Pal, 2Checkout, and Google Wallet (though I did not test these).
Basic elements of your design can be modified through the admin area too: however, I found the options available for creating different packages to be limiting.
I still have no reason why this option is in the account area for people who are dating.