I subscribed to Adobe to get Photoshop for a bit but it's so expensive and I never took to either the program or their business model. All my paints in the SOH library were done with paint.net; the Windows-like UI suits me, it's well supported and regularly updated, and there's a big library of plug-ins to move it at least a little way in the direction of Photoshop. I'm sure much the same can be said of GIMP, which probably has more features out of the box but (I think) is trickier to use.