My son is an 8th grader in the regular (non-magnet) program at TPMS and I agree completely with the PP--it's a great school all around. The school is full of smart, high-achieving kids, not just in the magnet. Over 75% of the student body made honor roll last quarter, very few schools match that number.
http://connectedcommunities.us/forumdisplay.php?f=153
And I also agree that the Blairs is nicer than Silver Spring Towers, and is probably the apartment community in downtown Silver Spring with the biggest population of kids.
We know lots of families at SSIMS, and they are happy as well. You won't go wrong either way for middle school
But If you think you might still be in the apartmentwhen your child reaches high school, you should definitely consider the Blairs, because that makes Montgomery Blair HS your home school, and that is important.