I tried Pinta, and honestly it has so many subtle differences from PDN, it was really uncomfortable and unproductive for me. I could not get to like it, but will give it some more time.

Also the icons are terrible (at least on the mac), I find it really hard to identify a tool, these monochrome icons set me off and slowed me down since Visual Studio 2012. This fad is a really good example for design trends ruining productivity.