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Full user review
"Great free program, but lacks some basic features"
Has many tools to help you alter a photo, many filters and effects. Easy to use, you don't need a degree to do what you want, but it helps to know the terminology (sepia, color curves, vignetting, etc.). Very simple interface, perfect for beginners.
It's not for advanced users. Many basic features missing (one big glaring one is the "smudge" tool). It'll get the job done in a pinch, but if you are used to more choices and have even the slightest knowledge of $$ programs, this won't do.
I could go into more detail, but I think my pros and cons say it all.