I dig the $9.99 plan, too. Nothing much to add to Graham’s post except to observe that it works like it should, and is easy to cancel and restart as I’ve done a number of times. You’ll find plenty of folks to offer alternatives to Photoshop, and at this point I’m pretty sure I’ve tried them all — and I keep coming back to the original. They’ve all got something to commend themselves (not least is the pay once thing, sure), but they also all lack something or other that I find that I’d rather not live without.
Which is also how I know that it’s easy to stop and start your CC subscription as you see fit. That’s exactly what I do. ? As Graham notes, you can’t use Photoshop for new work while you’re not paying, but the images stay where you put them (your computer, Dropbox, etc), and most of the PS alternatives will open your PSD files just fine.
Most of the time, I’m month-to-month, preferring flexibility to saving a bit with an annual subscription, but your mileage will vary. The main thing I want to emphasize here is that the $9.99 plan works.