I just did a test, I let both Inforapid and Agent Ransack search for
files containing the string utopia on my E partition, which contains
3GB of data files of all kinds of formats.
Ransack was faster, 7 min, Inforapid 10 min. Both found 872 files.
The user interface is much better in Ransack as I see it. It uses my
windows colors, IR uses bright white as background, which to me is as
disturbing as messages using all capitals, or like somebody shining a
strong light in my face.
IR also shows a big box with About details in the search result field.
So to me Agent Ransack is very good, Inforapid is very irritating, does
not have the courtesy to use my chosen windows colors, and is slower.
But if you like bright white backgrounds they have roughly the same
capability.