First off, I'd like to say this:
It won't be a waste of your time to get anything Berkeley Review, I can promise you that.
TBR is a really small company, so you're just gonna find a higher number of ppl using other books. I've seen a few posts where ppl who did awesome on their mcat used TBR for all the subjects, so don't worry. I'd say, if you need some in depth review and/or more practice, defintiely get the TBR books. I wasn't a science major and I've been outta college for a year, so I need extra content review and practice.
personally, I found TBR bio to be awesome for anatomy. They have two books, the "first" of the two bio books is anatomy and the second is the cell, micro, metabolism, and genetics. I could be wrong though. the TBR passages are sometimes super easy and sometimes really hard--I will get 90% on three passages straight, and then 20% on the next three b/c I don't know the details they want. But, hey, that's not a bad thing if you ask me....
The way I see it, maximize all your resources. I love that the TBR bio passages are really experiment based--I sometimes have trouble with those kinds of passages, and they always have a ton of experiment based passages. TBR is also awesome b/c of their answer explanations.
I've used TBR and EK for bio, and the two are awesome. EK is notoriously skimpy on detail, and TBR is rather extravagant with extra tidbits of info. So I feel i've found a happy medium. I use EK 1001 and TBR passages for all 4 subjects, and they're great.
Hope that helps answer your question!
