I use Adobe Photoshop CS2 AND Paint Shop Pro 9. Each of them have certain features that augment my work and I often find myself loading an image in one program, working a bit, then loading it in the other to do more.

I actually just upgraded from Adobe Photoshop 5 to CS2 (I know, big jump but I had to have a reason to explain the expenditure). So right now I'm much more comfortable with PSP9.