I completely agree with Cenocre when he writes "Hard to comprehend these bad reviews"
I've used Spell Catcher for about a decade, and it is an essential application for me.
It has a wide range of features so initial setup may take a bit of work. For those having trouble, it has a thorough Help, a tutorial, a forum, and Evan is very responsive.
If it still is complicated, Macupdate allows people to rate Ease of Use.
Rating the software itself I give it 5 stars. I use it for spell checking in different languages, shorthand expansion, statistics, manipulating text, etc.
Ironically, he best endorsement may come from Stevebaron not using it and typing "bad!" as a review, fitting multiple errors in only 4 characters. ;)