A peer-reviewed article of this Preprint also exists.
Without a doubt it beats Google search engines. I think it's good for preprints, thesis retrievals, and general non-indexed material. I tend to run bots and non-conventional methods on top of systematic searches, and find the information it yields mind boggling. Like looking for gems in a sea.
I find this site really good (listed in Cochrane handbook) when coming up with evidence-based filters: https://sites.google.com/a/york.ac.uk/issg-search-filters-resource/filters-to-identify-randomized-controlled-trials-and
I find Kappa statistic, and internal validity testings can be very useful in determining whether the search was tight or not.
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