Hello FroggEye, you are 100% correct there are tons of scripts out there that provide the same look on the front-end of a website but you have to edit the code manually and like you said not very flexible, user-friendly, or easy to edit. We are the only one integrated with Kentico (that I am aware of). What you're paying for here is the integration into Kentico (and the source code for such...), no code has to be touched at all by a content editor on the back-end for management of the banners, everything is handle by typical Kentico modules like the image uploader, URL selector, etc... in a Document Type.
If you so desire, you could possibly edit out our js slider and put in another with some coding but again this gives you the ability to do so and provides you a management structure on the backend within Kentico.
Hope this renews your interest in our webpart and if you have any more questions please feel free to drop me an email at: jimmoATthejimmo.com (where AT = @)
Thanks for your comment!