We have used the new system. We literally arrived like 10 days ago. It was quite easy, however, it took a long time after arriving. If you have someone picking you up from the airport, like your hotel or another driver, be sure to let them know that the process can take more than an hour after landing.
We landed at 11:45pm, and didn't get out of the airport until 1:15am. I'm so glad that someone was looking after our stuff when it came off of the carousel. We were quite worried.
They took FOREVER to take our photos and process the stickers, but they were quite friendly and they really didn't go into much detail before letting us in. Other than showing our passports, there wasn't much of a checkpoint there.