I'm a Quicksilver member but don't use the kiosks. Mostly I use the online check-in which saves me from waiting in line. However, there's a catch.
It's been my experience that if you use a coupon then you can't use the Quicksilver kiosks or the online check-in. Discount codes sometimes allow me to use the online check-in, but not always. If I can check-in online, then all I have to do is go straight to the garage, pick out a car and give my printed reservation to the gate attendant.
If I have a coupon / discount code and can't check-in online, then there is (or was?) a desk for Quicksilver members to check-in directly. DME has worked so well for us that it's been a year since I've needed to rent a car.
Hope this helps!
