A great software i recommend to anyone, it has interesting features, many pre-made effects which you can modify by your own taste. Of course, you are also able to create your own effects, personally, usually i am fine with most of the effects, the altering i am doing on them is just brightness/contrast mostly.
Is it worth the money? Hard to say... 12 euros for a photo editing software? Hell Yea!
Ease of use:
It's actually really damn easy to use it, every feature you might need you can find easily.
Even the newbiest user can play around with the advanced features.
At this chapter i give it 10/10.
Photoshop might have more options and might be advanced, but to be honest, it really isn't that big of a difference.
Camerabag has pretty much all the features you can think of, it's also cheap and works flawlessly.
I only had 1 or 2 crashes so far, don't know the exact reason, but i didn't lose anything important.
Get it! It's not expensive, and it offers many things for this amount of money, you won't be disappointed at all.