After a while, they will have a free trial version available. You might want to have a look see. My opinion is that e-on offers the most power for the least learning curve. And the tools all tend to be visual, not numerical, so although you are adjusting sliders and moving function curves around (a bit like Photoshop curves) you can pretty quickly see the effect. So, you might be suprised a the low and not very steep curve.