Does anyone have experience with the SolidWorks Extended Subscription Services (ESS) offered by DS SolidWorks?

I have recently been informed of this service and would like to gauge the experience of other companies who use this support. Specifically how you have taken advantage of the offered services and if you feel the costs are justified.

I dont think it is a very well known package but I'm sure it is available to all customers large and small. I wont list what is offered, but it seems on paper quite worthwhile.

Any feedback would be appreciated!