Just tried it (Score 0)

This thing doesn't touch Photoshop as far as usability goes. The Gaussian blur plugin even broke when I tried to adjust the slider bar with my scroll on my mouse. (Granted, I was moving it faster than I should have...) Also the Gaussian preview as you are adjusting it is really bad. Blocky at best.

It looks to me like this thing may even be using the Paint.Net backend (but I'm not a programmer, so don't flame me if I'm wrong..)