I have used a lot of sliders and this one, hands down, is the winner. Takes a bit of getting used to but is well worth the time to go over the extensive and excellent documentation.
I notice with the latest release, 2.1.17, that they have added examples of what you can accomplish with the free "demo" version. This is a welcome addition as it demonstrates some of the not-so-obvious methods.
I purchased the pro version and am even more impressed by what it can do.
So far, I have not had to request support, but from reading the reviews, it sounds like that is top-notch too.