Paul,
You are absolutely right, when I did the first test, I wanted to take the break and the test ended. so I re-took the test and managed to not take the break the second time.
The score do not reflect your real one, the Quantitive real GMAT is much harder but your score will be higher than the PR one, I will say the real GMAT score will give 5 more points. The Quantitive questions look interesting, some combinations , permutations , probabilities, standard deviations and a lot of experimental questions that reflects the real GMAT but in an easier way.
I liked the Verbal section, a lot of Bold faced questions, but one again I think those questions are easier than the real GMAT and the score do not reflect the real score. The Bottom line is that I think if someone want to estimate his real GMAT score, just add 20 to 30 points to the new PR CD's...