My 15-year-old took it yesterday, too. I forgot to ask him how he thought it was. I don't think having sophomores to take it for practice is that unusual. Our older son also took it as a sophomore at a different high school.
We didn't realize until after sophomore year that some students take the SAT early and often, too. Our school had two National Merit winners (and four commended scholars) and the other kid had already taken the SAT a couple times when he did the PSAT. My son never even thought about doing that, although it would probably be a good idea if you're expected to be a contender for the scholarships. He took the SAT only two times -- once in seventh grade for TIP and again as a high school junior.
The PSAT/early SAT as a predictor was right on target for my kid, too. He was told to look for a score as a junior that was 400 points higher than the TIP one -- exactly what he scored. His SAT score was also exactly what the PSAT predicted.