Dave is a legit teacher. I wish I could've found him before I blew my wad (read: too much cash) on crappy Kaplan test prep garbage and before a week prior to the tests... I found his podcasts because after going through an entire course and practicing I was still coming up -20, -22 etc. After watching the free content he has available, I moved up to a -7 or -9 depending on the test.
For example, the LG methods described elsewhere work but take too long or are just plain going about it wrong. Just from the free videos I got this - global accounting, conditionals, could be true, must be true. Just the fact that I'm doing it in that order shaved minutes off of each question. The thought never occurred to me without it, and worse, it wasn't even suggested in the traditional course. The closest it got was "don't skip the global accounting, it's a free point - which I now know is total and utter garbage.
Luckily my wife will be doing the LSAT within the next couple of years - she will definitely take the comprehensive course. (I'll probably still watch some of the videos too, not only is he informative he's entertaining.)