Hi yes the payoff structure at expiration is very easy, one can do it in your head (or 3 columns in excel if you want). Exposure to the greeks is another story ofcourse.
It's a good site, but I have a somewhat restrictive firewall, but that site unfortunately seems to use many different addresses in their pages, which I have all to allow in the firewall, so I haven't managed yet to get it fully operational :-(
