Hello everyone from Uruguay!
Two days ago I headed for Prometric Center in Buenos Aires and took the exam. It was a perfect ace , AT in all domains!
The PMP Prepcast simulator played a very important role given the accuracy of the questions to simulate the actual ones.
Even though I feel confident in english enough I asked for the Spanish aid to see how it worked. It was worthless since I didn't have to make use of it and half of the screen was "wasted" for the translation. Also, you needed to use the Scroll down bar and button when wordy questions and that took some extra time. Here is my tip: if you feel ok with english don't use foreing language just in case.
Cheers!
Matías.