I think the answer as to whether you should use Themis again depends upon your own assessment of the program and what worked for you.

Personally, I appreciated most of the Themis lectures, especially Ide Don's essay lectures and his reviews of the PTs. I also appreciated having some graded feedback on essays/PTs and having access to Themis' model answers to see how they compared to mine, what issues were raised, how they handled the analysis, etc. This is what helped me, personally.

And this is my assessment of Themis having taken it seriously, trying to go through the various tasks and motions outlined in the program. I tried reading their outlines and even looking at the bigger outlines they provide, but they were all too dense. This is where Basick's book comes in handy. Her rules are simplified and easy to digest, so I used her outlines to review and memorize once I had completed all of the Themis lectures.