I hope my post didn't come across as an attack, because you seem very defensive. I also hope you're not insinuating that I am a warez user..
I tried GIMP quite some time ago and don't remember all the details, so my post was based on the assumption that Phemox was right about CMYK being the default. Anyway, I've never had any problems whatsoever with ps.
As to paint.net (because that's what we where talking about), I looked at it some time ago, and thought it had a pretty good interface (better than GIMP (<-- that's just my opinion, I'm not trying to "convert" you!), but lacked quite some important features. It has probably improved, but I'm not going to change tools anymore.