Yeah they were not good for me. But it's a different program. Just sharing the same name.
It has the same pen stability to SAI and more brush custom options than Photoshop.
Though the main point I'm using this is ability to produce backgrounds easily. It has many rulers, perspective tools, vectors, and 3D models for backgrounds. for example:
I set up this scene by 3 minutes. just drag&dropped a 3D room model onto layer then added layer effects, that's all.
One issue I have is the speed performance isn't as good as SAI. So I draw my characters with SAI and export them into Clip for backgrounds and other post-works.