Hello Bob,
MLO for iPad gives a range of purchase options. They boil down to two groups; you're either upgrading from version 1, or a new user of MLO HD.
In both groups you have a range of purchase options - All of these give you the Pro upgrade features listed by Alexandra, but give you the option of paying a little extra gratuity to support MLO development and support. (Development is very active on the iPad at the moment. At some point there will be a pause, while the developers apply the new features to the Android version. With the value I get from MLO, I was happy to give them the top upgrade price as a little extra financial support.)
Assuming you are a new user and not upgrading from MLO version 1 (which is a separate app no longer available on the App Store), you can purchase option 2 or, if you're a little more generous and feel you're getting value, option 4.
Regards,
Stéphane