Mariner Calc is decent software with some minor bugs.
However, I'd like to note how very difficult they make it for paying customers to upgrade their Mariner Calc installs.
I own a current, valid license for Mariner Calc.
To upgrade I had to fill out a form on their website with my name and email address and opt-out of their mailing list.
Then I had to confirm my email address "to reduce spam". That makes no sense, I am not emailing them I trying to upgrade my licensed copy of their app.
Anyway I do this and it takes me to the download page. I click on the download link and lo behold and I must AGAIN fill out this form and opt-out of their mailing list before they will give me the latest version of the app I paid $50 for.
Mariner, take a page from Panic, Adium, iBank and the likes and do NOT make your customers jump through irritating hoops to upgrade!!