I would like to be wrong on this, because it totally bites.
If a bunch of people here report actually being able to book Slinky passes at 7:15am or later, that will be good news.
If you don't get a G+ pass at 7am, you're stuck refreshing and refreshing. And all the time you're refreshing....you're gambling...and the longer you wait, the lower your odds of success, as you watch the return times creep later and later for the tier2 passes, but you keep hoping for a hit!
AND, all the time I was refreshing was time I wasn't able to get ready (dressed) to actually go to the park. HS opened at 7:30am.
I actually did have SDD - appear- to pop up as available at about 7:07am, but it was only a phantom. I instantly tried to book it, but it disappeared. And I moved quickly!
Also, the hotel quick serve opened at 7am.
In that half hour, we had to sacrifice something: get passes, get dressed, go to the park, or buy something for breakfast? (Okay, I actually had snacks in the room. I knew I couldn't actually hope to eat breakfast in the morning. Ha!)