The process isn't complex, but the explanation on the site is too long-winded. You just have to register your name and number once, then when you book they ask for your number to see if you're registered, but they don't always do that either. Then when you arrive you call them from your registered phone and they will tell you to come in or text you when the room is ready. That's it.
I like the new system. Sometimes when I call Pure and Linda is on the phone, she just answers "hey baby". I guess either my name shows up on the call display, or she just recognizes my number. Either way it's a nice touch.