If I could go back in time and watch myself deliberating on whether to pay the €49 for this component, I'd give myself a little slap in the back of the head for wasting so much time. The basic template is clearly structured for easy styling, and the configuration on the back end is a gold mine of options and considerations that the developer had the forethought to create. And the cryptic configurations are explained in detail, with clear recommendations. It's a beautiful component. Not to mention I agree that it makes the checkout process much smoother.
The project I subscribed for has very unique demands, and every time I've come up with something I need the component to do, they've already thought of it. I look forward to promised upcoming extensions, which will make this system even closer to what I need.
I also bought Workforce from The Thinkery and it (while simpler) is every bit as complete and usable as iProperty.
This is why we pay for extensions.