Slider Revolution is one of the most flexible sliders on the market. There really isn’t anything it doesn’t do. It has a little bit of a learning curve, but it is very flexible. You can see it in action here.
It also requires a license for each site (they don’t offer developer licenses).
We purchases developer rights to various themes that may help power your site. Theme developers put in a lot of time and effort to develop these themes. We pay them for their efforts.
Concierge support includes the right to use these themes. Some themes have a one-time charge to use the plugin indefinitely, other an annual fee to get access to upgrades.
If you choose to not use Concierge Support, then your themes will not be able to be updated until you purchase a license. You do not need to update your plugins, but it is always recommended.