Full user review
"Best free period. Contends with Photoshop."
There is no better free app out there. Period. Gimp comes close as it comes pre loaded more powerful than Paint.net. Nothing a few plugin install cant fix. Gimp is light years away in the user friendly bracket. Paint.net is just easy, powerful, and not a huge download at all!
Its basic platform while still great, does not come fully loaded with all the third party plugins that make this software a beast. So the only con is having to go locate and install those plugins. Essentially, no cons.
If you don't want to install plugins, then this software is best for basic to medium level editing. Grab some plugins for greatly increased power. Either way its free!