Really good slideshow. it's true that you can find some slideshows for free but they are not like this one. As most things that you pay for it offers good features but most important, great technical service. When i pay for something i usually do for its customers care program and skitter's is quite effective.
Also, i sent a suggest for them (about making the images you upload to your site to auto-resize to default size -that would be a very good improvement-).
Anyway, enjoy it. :)