I just want to add a footnote in the comments:
I made these videos a few months ago. From everything I can tell, the games have changed quite a bit. While all of the concepts in my series still apply (reraising aces and non aces, c-betting, etc), I have noticed a couple things. One is that people do NOT give you credit for aces necessarily when you 3bet and seem much more willing to play back in 3-bet pots. Similarly, you can tell who the people who never 3-bet with aces are, and 4-bet them liberally (when I say liberally, I mean with very good non-aces hands, of course).
The second thing is with respect to c-betting. Once again, people seem willing to call down lighter and peel lighter. This should probably mean we're 1)c-betting less frequently, 2) stacking off a little lighter, especially after not c-betting, and in general just tightening up.
I think the current environment of the mid stakes games is even more profitable than it was before. I see insanely bad stack offs at least 20 times every time I open up tables for 10 minutes. So tighten up a little bit (while still remaining aggressive), and the money will start rolling in.
I have yet to make the final two episodes of this series (actually the final three, though week 6 will be based on hands I have played before). The final 2 weeks involve live play, and I will try to focus a little more on the games as they are currently played. Once again, this doesn't mean that anything in my series is wrong or not useful; just trying to give a heads-up for things you might see and what to start thinking about.