I love that it integrates so easily with my writing programs, especially since they have recently improved their Scrivener integration. Since commas are my nemesis, PWA helps enormously with making my writing clean. I use it mostly for grammar and punctuation, but I also use it sometimes for style, such as finding repetitive sentence starts, passive sentences, and crisper wording. I love that it gives suggestions for alternatives when it comes to style. It doesn't just find things that could be better or are incorrect--it shows you how you could improve it and then lets you decide whether you want to go with option 1, 2, 3 or something else entirely.

I love that it does a good job of picking up not only spelling and grammar errors but also custom errors that you use specify to help you achieve a particular style guide.

This software integrates with everything and makes my writing so much better. I use it many times every day and keep it connected to all of my writing tool. The simple icon makes it easy to use or remove from any application and the customer support is top notch.