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I'd say it is quite useful to quickly get a birds eye view of a topic.
Do you trust anything written in there? Obviously not, but you can find a lot of useful keywords related to a topic you know nothing about and save yourself quite some time.
I mean, 5 minutes ago I didn't know what an MTT assay was. It was what I had in mind and what I was more or less searching for, but had no specific idea of how it worked and what it was.
Now I know what it is and I know where to find specific information about the methodology if I need to.
And I even had the time to write this post...
Normally, I'd have to find a review about these methodologies and skim through it to find the one I was interested in.