Researching it further, I am very happy with what I have found, and there are a few features I overlooked I’d like to share.

I began with the menus and checked out the Tip of the day. With the nice animated effects, it is very helpful in revealing some not-so-obvious features.
Visually, “Syntax” highlighting is helpful for inputting functions or calculations with more than a few operations. Parentheses grouping is also available and helpful for the same purposes.

Insert function list via Control-F is awesome. This present us with a quick list to some commonly used functions we are bound to use over and over.
The Inline result display I find essential. It calculates and displays the current result as you type your operations. This is helpful to double check your work as you go.Another area I have seen grow since 0.8 is the built-in lists of functions and of constants.

Important to me, is the sophisticated Qt interface that allows users to drag and drop panes which contains lists for functions, history, variables, constants. These are also undockable, if that’s the way you want to calculate.

Unfortunately it lacks a Load session feature, however the user is given an option to save a file, yet so far the result has always been an empty file. It has been reported at their bug tracker as a reproduced error though.

It needs RPN input, which I also saw is being developed.

Also in-development, but of more interest to me, is a huge project of an open-source math book being integrated with the application. This is a lofty goal, but one that can really help to make the software stand out on it’s own even more.

Overall, I think I’ll be using SpeedCrunch more and more for doing my mathematic evaluations.

It works on Windows too, so if you’ve decided to stick with that operating system, here’s a better replacement for the included calculator, and at a great price with code you can trust that is actively being enhanced.