I think you misunderstood what I said the value of these books was, for me. Overall you get as many practice Q explanations as TPR, but waaaay more Qs. I do agree that explanations to those other Qs would be helpful, but those were just content Qs, easily explained by going back to the chapter. That is why I found this book helpful, not for the MCAT style passages and Qs (which there were about 10 per chapter) but for the content style Qs which helped my drill the psych/soc (my weakest area). Still in hindsight, I would say get TPR and the NS S&P book for psych/soc MCAT practice, which has way more MCAT style practice than EK or TPR, but no content in them.
For the content books:
EK has great passages and Qs, but like too few content Qs. I think TPR strikes the right balance of the two, as far as psych/soc goes.
I would say for content TPR > EK >NS
For content only Q reinforcement TPR >NS >EK
For mcat style practice EK >NS & TPR
Overall: TPR > EK > NS
Even better than all of them though, was the free Khan stuff ( as far a content and practice Qs). I wish the AAMC hadn't been so lazy about creating new Psych/Soc Q packs. They had years but decided to let Khan do it. Khan is nice but they aren't the AAMC and many of the passages were just abysmal. I wouldn't have minded paying $10 for a Psych Q pack or a Soc Q pack. The AAMC was lazy enough to recycle old Qs and charge me for it, why couldn't they come up with Q on the new content, the stuff they KNEW would be the cause of the most anxiety. Now they are coming out with another FL exam and still no biochem, psych or soc Q packs.
Still, free is free and the passages that were close enough to the real thing (~ 1/3) make it worth it overall.