Two summers ago I took courses at Summa [1], an SAT prep course in the San Diego area. The valuable material wasn't the classes reviewing geometry or speed-reading -- it's taking and reviewing the SAT repeatedly. Organizations like Summa can produce SAT-like practice tests, because the highly-prepared kids have probably taken all of the example tests the College Board provides.
The SAT is an easy test; no individual question is really that hard. Getting a high score is about knowing how to take the test, and this is learned by taking it many times. Unless the College Board releases many more practice tests (with answer keys and explanations), I don't think this program will mean much.
Note that I'm talking about getting very high scores -- the SAT is a completely different game when your goal is to get into ultra-competitive schools. For the average person who might not really understand what to study for, this program will be great.