Being a supporter of Softwood products, I bought the whole line and have used Final Calc many times. I served my needs well, but then I am not a heavy-duty user of spreadsheets, so if it has many deficiencies I would not know about them.
I have also used Advantage previously. It was okay if you don't mind the 1.3 looking interface. I have TurboCalc and Analyze, but have not used them yet.