They were running the new standyby line yesterday @ RnR about an hour after opening when the line jumped to around 90 minute wait. We didn't use it since we had fp's, but I talked to several folks about it who did while waiting for limo pre-show and in line for boarding. Mixed reviews. Some liked it since they could sit instead of standing the whole time, others liked it since they could do something (GH, etc..) while waiting for their group to be called. And then others noted there were lines of people waiting for GH and the games and some were still lining up waiting for their group to be called (think folks who stand at the front of the fp return entrance to attractions before their time).
What I could tell with our informal poll, more positives than negatives.