My experience relies on how useful and usable the products are for the customers. I found that Scrum is the natural way of thinking and developing software. Scrum is the right way to get useful products. That is because Scrum integrates developer artful innovation with customer needs. I have been facilitating as ScrumMaster, and I can confidently say that it delivers what customer wants.
On the other hand, Usability Studies gives the way to prove whether a software is usable and the way to improve it. Facilitating with real users gives you the real feedback need to deliver a product with a rich user experience.
My task in Costa Rica has been about evangelizing about Agile and Usability.
Project Management, Software Usability, Scrum