No offense taken... but is it so wrong to 100% believe in the materials I work with? For the longest time I've lurked and said nothing, but finally hit a point of figuring what the heck?, I might as well toss my two cents in. If someone thinks it's a plug, so what? As long as it's honest and doesn't attack anyone or anything, then it's fine.
If you knew me or our company philosophy, you'd know that if we say something is good, we are saying it not to promote but because we are incredibly proud. I've written materials for two companies and a medical school post-bacc program. I've been teaching for the MCAT for over fifteen years. I've learned a great deal about what students fear and where they make their common mistakes. We've developed our materials based on this feedback. At this point, I honestly believe that our physical sciences materials are the best out there. I can also say that there are a bunch of things I'd love to improve about it to make it even better. And I readily admit that our apporach is not for everyone. But average scores of more or less 10.2 to 11 since 1993 must mean it's working.
So perhaps you see it as a plug. From my moniker, it's easy to reach that opinion. But someone asked for an opinion on materials, so technically, isn't every response a plug? Do you believe I shouldn't express an opinion? I think all opinions should be expressed and leave it to the reader to make a choice, assuming they have one to make.